Memorial Museum

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Visitors at the pools of the National 9/11 Memorial Museum, near the former site of the World Trade Center Associated Press photo

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A video presentation at the opening ceremonies of the National 9/11 Memorial Museum in New York on May 15th of this year Associated Press photo

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FILE- In this May 14, 2014 file photo, a sign tracking the time Osama Bin Laden was at large is displayed at the National Sept. 11 Memorial Museum in New York. The museum is the latest in a series of memorials-as-museums that seek to honor the dead while presenting a full, fair history of the event that killed them. And the Sept. 11 museum strives to do that at ground zero while the attacks are still raw memories for many. (AP Photo)

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FILE - In this May 15, 2014 file photo, a quote from Virgil fills a wall of the museum prior to the dedication ceremony at the National September 11 Memorial Museum in New York. The museum was designed with the psychological well-being of the public in mind. But behind the wrenching sights and sounds of the National Sept. 11 Memorial Museum lies a quiet effort to help visitors handle its potentially traumatic impact, from built-in tissue boxes to a layout designed to let people bypass the most intense exhibits if they choose. (AP Photo/The Star-Ledger, John Munson, Pool)

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Visitors gather on the plaza of the National September 11 Memorial to watch a telecast of the dedication ceremony for the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/The Daily News, James Keivom, Pool)

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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)