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APTOPIX Royals US Visit

Kate, Duchess of Cambridge, and Britain's Prince William are escorted by Joe Daniels, president & CEO of the National September 11 Memorial & Museum in the Hall of Faces, during their visit to the National September 11 Museum, Tuesday, Dec. 9, 2014. Prince William and Kate are on the last of their 3-day tour of New York City, their first visit to the United States since a trip to California in 2011. (AP Photo/Richard Drew, Pool)

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Royals US Visit

Britain's Prince William, the Duke of Cambridge, left, joins his wife Kate, Duchess of Cambridge, as she lays a wreath during a visit to the National Sept.11 Memorial and Museum, Tuesday, Dec. 9, 2014 in New York. (AP Photo/Jason DeCrow)