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Dedication of National 9/11 Memorial & Museum

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APTOPIX Sept 11 Museum

<p>A New York City firefighter looks at the last column recovered at the World Trade Center site at the dedication ceremony for the National 9/11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum memorializes the September 11 attacks on the World Trade Center in New York. (AP Photo/John Angelillo, Pool)</p> A New York City firefighter looks at the last column recovered at the World Trade Center site at the dedication ceremony for the National 9/11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum memorializes the September 11 attacks on the World Trade Center in New York. (AP Photo/John Angelillo, Pool)

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Obama Sept 11 Museum

<p>President Barack Obama, first lady Michelle Obama, former New York City Mayor Michael Bloomberg, former Secretary of State Hillary Rodham Clinton, former President Bill Clinton, and Diana Taylor, tour the Memorial Hall at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. (AP Photo/Carolyn Kaster)</p> President Barack Obama, first lady Michelle Obama, former New York City Mayor Michael Bloomberg, former Secretary of State Hillary Rodham Clinton, former President Bill Clinton, and Diana Taylor, tour the Memorial Hall at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. (AP Photo/Carolyn Kaster)

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APTOPIX Sept 11 Museum

<p>President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum opens to the public on May 21. (AP Photo/John Angelillo, Pool)</p> President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. The museum opens to the public on May 21. (AP Photo/John Angelillo, Pool)

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Sept 11 Museum

<p>President Barack Obama greets Alson Crowther and Ling Young during the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/The New York Times, Chang W. Lee, Pool)</p> President Barack Obama greets Alson Crowther and Ling Young during the dedication ceremony at the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/The New York Times, Chang W. Lee, Pool)

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Sept 11 Museum

<p>First responders from the FDNY and Port Authority exit the stage during the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)</p> First responders from the FDNY and Port Authority exit the stage during the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)

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Sept 11 Museum

<p>People attend the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)</p> People attend the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)

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APTOPIX Sept 11 Museum

<p>Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak beside the symbolic World Trade Center final beam, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)</p> Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak beside the symbolic World Trade Center final beam, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)

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Sept 11 Museum

<p>Former New York Gov. George Pataki speaks as photos of 9/11 victims are projected, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)</p> Former New York Gov. George Pataki speaks as photos of 9/11 victims are projected, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)

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Sept 11 Museum

<p>This Sept. 10, 2012 file photo shows electronic images of victims of the attacks of Sept. 11, 2001, destined to be a part of the future 9/11 Memorial Museum, during a news conference in New York. The museum will be dedicated in a ceremony attended by President Barack Obama on Thursday, May 15, 2014. It will open to the public May 21. (AP Photo/Mark Lennihan, File)</p> FILE - This Sept. 10, 2012 file photo shows electronic images of victims of the attacks of Sept. 11, 2001, destined to be a part of the future 9/11 Memorial Museum, during a news conference in New York. The museum will be dedicated in a ceremony attended by President Barack Obama on Thursday, May 15, 2014. It will open to the public May 21. (AP Photo/Mark Lennihan, File)

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Sept 11 Museum

<p>The "Survivor Stairs," left, from The World Trader Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The "Survivor Stairs," left, from The World Trader Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>The burn mask, right, of a World Trade Center survivor who was injured by burning jet fuel, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The burn mask, right, of a World Trade Center survivor who was injured by burning jet fuel, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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APTOPIX Sept 11 Museum

<p>The remains of Fire Dept. of New York Ladder Company 3's truck are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The remains of Fire Dept. of New York Ladder Company 3's truck are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>Members of the Port Authority of New York and New Jersey Police pause at the Ground Zero memorial site during the dedication ceremony of the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/Spencer Platt, Pool)</p> Members of the Port Authority of New York and New Jersey Police pause at the Ground Zero memorial site during the dedication ceremony of the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/Spencer Platt, Pool)

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Sept 11 Museum

<p>A rose is placed on a name engraved along the South reflecting pool at the Ground Zero memorial site during the dedication ceremony of the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/Spencer Platt, Pool)</p> A rose is placed on a name engraved along the South reflecting pool at the Ground Zero memorial site during the dedication ceremony of the National September 11 Memorial Museum in New York on Thursday, May 15, 2014. (AP Photo/Spencer Platt, Pool)

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Sept 11 Museum

<p>Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)</p> Recovery workers Manny Rodriguez, Pia Hofmann, Det. Anthony Favara and Lt. Stephen Butler speak during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)

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Sept 11 Museum

<p>The Last Column was the final steel beam ceremonially removed from Ground Zero is shown at the dedication of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/Timothy A. Clary, Pool)</p> The Last Column was the final steel beam ceremonially removed from Ground Zero is shown at the dedication of the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/Timothy A. Clary, Pool)

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Sept 11 Museum Preview

<p>Shoes and personal items on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)</p> Shoes and personal items on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)

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Sept 11 Museum Preview

<p>New York City Fire Department Firefighter Christian Waugh's helmet he wore on September 11, 2001, are on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)</p> New York City Fire Department Firefighter Christian Waugh's helmet he wore on September 11, 2001, are on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)

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Sept 11 Museum Preview

<p>Objects recovered from the World Trade Center site on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)</p> Objects recovered from the World Trade Center site on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)

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Sept 11 Museum Preview

<p>A helmet New York City Fire Department Captain Patrick John Brown wore on September 11, 2001, on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)</p> A helmet New York City Fire Department Captain Patrick John Brown wore on September 11, 2001, on display during a press preview of the National September 11 Memorial Museum on Wednesday, May. 14, 2014 in New York. The museum opens on May 21, 2014. (AP Photo/The Daily News, James Keivom, Pool)

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Sept 11 Museum

<p>Former President Bill Clinton, center, shares a laugh with first responders at the end of the Dedication Ceremony of the National September 11 Memorial Museum at Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)</p> Former President Bill Clinton, center, shares a laugh with first responders at the end of the Dedication Ceremony of the National September 11 Memorial Museum at Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)

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Sept 11 Museum

<p>Former New York City Mayor Rudolph Giuliani hugs retired New York City Fire fighter Mickey Kross as he greets first responders from the Sept. 11, 2001 World Trade Center attacks during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Mike Segar, Pool)</p> Former New York City Mayor Rudolph Giuliani hugs retired New York City Fire fighter Mickey Kross as he greets first responders from the Sept. 11, 2001 World Trade Center attacks during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Mike Segar, Pool)

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APTOPIX Sept 11 Museum

<p>Fragments of the fuselage of Flight 11, that hit the World Trader Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> Fragments of the fuselage of Flight 11, that hit the World Trader Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>Former New York Mayor Rudolph Giuliani introduces 11 members of the FDNY and Port Authority of New York and New Jersey at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/John Angelillo, Pool)</p> Former New York Mayor Rudolph Giuliani introduces 11 members of the FDNY and Port Authority of New York and New Jersey at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/John Angelillo, Pool)

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Sept 11 Museum

<p>New York City firefighters salute during the national anthem during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)</p> New York City firefighters salute during the national anthem during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)

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Sept 11 Museum

<p>Retired New York City Fire Fighter Mickey Kross speaks at the podium as he and other first responders of the Sept. 11, 2001 attacks on the World Trade Center take part in the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Mike Segar, Pool)</p> Retired New York City Fire Fighter Mickey Kross speaks at the podium as he and other first responders of the Sept. 11, 2001 attacks on the World Trade Center take part in the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Mike Segar, Pool)

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Sept 11 Museum

<p>President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/John Angelillo, Pool)</p> President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/John Angelillo, Pool)

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Sept 11 Museum

<p>The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>The twisted remains of a portion of the television transmission tower from the World Trade Center is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The twisted remains of a portion of the television transmission tower from the World Trade Center is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>The Family Viewing Platform, and memorabilia from the World Trade Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> The Family Viewing Platform, and memorabilia from the World Trade Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>A two-inch thick World Trade Center steel column, that was bent into a horseshoe shape, and facade segment, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> A two-inch thick World Trade Center steel column, that was bent into a horseshoe shape, and facade segment, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>Steel from the World Trader Center north tower floors 97 and 98, left, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> Steel from the World Trader Center north tower floors 97 and 98, left, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>A section of steel facade, from floors 96-99 of the north tower of the World Trade Center, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> A section of steel facade, from floors 96-99 of the north tower of the World Trade Center, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

<p>A steel beam from the World Trade Center stands at the center of Foundation Hall where the dedication ceremony will take place at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)</p> A steel beam from the World Trade Center stands at the center of Foundation Hall where the dedication ceremony will take place at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)

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Sept 11 Museum

<p>A Port Authority of New York and New Jersey worker views a display of the attack on the Pentagon at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)</p> A Port Authority of New York and New Jersey worker views a display of the attack on the Pentagon at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

Two tridents from the World Trade Center are on display inside the National September 11 Memorial Museum before a dedication ceremony at the museum Thursday, May 15, 2014, in New York. The museum will open to the public on May 21. (AP Photo/Allan Tannenbaum, Pool)

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Sept 11 Museum

A sign tracking the time Osama Bin Laden was at large is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo) A sign tracking the time Osama Bin Laden was at large is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

A salvaged bicycle rack, that was located on the northern edge of the World Trade Center site, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo) A salvaged bicycle rack, that was located on the northern edge of the World Trade Center site, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

The only existing model of the World Trade Center is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo) The only existing model of the World Trade Center is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

Members of the media tour the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo) Members of the media tour the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

Members of the media tour the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo) Members of the media tour the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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Sept 11 Museum

This June 16, 2011 file photo shows a fire-scorched cab of a New York City Fire Department truck, damaged in the attacks of Sept. 11, 2001, in storage at JFK Airport in New York. The truck will be on display in the 9//11 museum that will be dedicated Thursday, May 15, 2014, in a ceremony attended by President Barack Obama. It will open to the public May 21. (AP Photo/Mark Lennihan, File) FILE - This June 16, 2011 file photo shows a fire-scorched cab of a New York City Fire Department truck, damaged in the attacks of Sept. 11, 2001, in storage at JFK Airport in New York. The truck will be on display in the 9//11 museum that will be dedicated Thursday, May 15, 2014, in a ceremony attended by President Barack Obama. It will open to the public May 21. (AP Photo/Mark Lennihan, File)

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Sept 11 Museum

This file photo of June 19, 2011 shows an American Airlines slipper stored in Hangar 17 at John F. Kennedy International Airport in New York. The slipper is an artifact from the Sept. 11, 2001 attacks that is to be part of the National September 11 Memorial Museum, which will be dedicated Thursday, May 15, 2014, in a ceremony attended by President Barack Obama. It will open to the public May 21. (AP Photo/Mark Lennihan, File) FILE - This file photo of June 19, 2011 shows an American Airlines slipper stored in Hangar 17 at John F. Kennedy International Airport in New York. The slipper is an artifact from the Sept. 11, 2001 attacks that is to be part of the National September 11 Memorial Museum, which will be dedicated Thursday, May 15, 2014, in a ceremony attended by President Barack Obama. It will open to the public May 21. (AP Photo/Mark Lennihan, File)

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Sept 11 Museum

<p>A steel beam from the World Trade Center stands at the center of Foundation Hall where the dedication ceremony will take place at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)</p> A steel beam from the World Trade Center stands at the center of Foundation Hall where the dedication ceremony will take place at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)

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Obama Sept 11 Museum

<p>President Barack Obama and former Secretary of State Hillary Rodham Clinton tour Memorial Hall at the National September 11 Memorial Museum with former New York City Mayor Michael Bloomberg, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. (AP Photo/Carolyn Kaster)</p> President Barack Obama and former Secretary of State Hillary Rodham Clinton tour Memorial Hall at the National September 11 Memorial Museum with former New York City Mayor Michael Bloomberg, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. (AP Photo/Carolyn Kaster)

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Obama Sept 11 Museum

<p>As the twin towers are displayed behind him, President Barack Obama speaks at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. (AP Photo/Carolyn Kaster)</p> As the twin towers are displayed behind him, President Barack Obama speaks at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. (AP Photo/Carolyn Kaster)

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Obama Sept 11 Museum

<p>President Barack Obama and former New York City Mayor Michael Bloomberg tour the destroyed Ladder 3 truck at the September 11 Memorial Museum, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. He says, quote, "Nothing can ever break us." (AP Photo/Carolyn Kaster)</p> President Barack Obama and former New York City Mayor Michael Bloomberg tour the destroyed Ladder 3 truck at the September 11 Memorial Museum, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. He says, quote, "Nothing can ever break us." (AP Photo/Carolyn Kaster)

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Sept 11 Museum

<p>The honor guard comprised of members of the New York City Police, New York City Fire and Port Authority Police department's prepare prior to the dedication ceremony at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)</p> The honor guard comprised of members of the New York City Police, New York City Fire and Port Authority Police department's prepare prior to the dedication ceremony at the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/The Star-Ledger, John Munson, Pool)