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NEW YORK, NY - MAY 14: Cards, patches and mementos of those killed at Ground Zero are are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the public on May 21 following a six-day dedication period for 9/11 families, survivors, first responders, workers, and local city residents. For the dedication period the doors to the museum will be open for 24-hours a day from May 15 through May 20. On Thursday President Barack Obama and the first lady will attend the dedication ceremony for the opening of the museum. While the construction of the museum has often been fraught with politics and controversy, the exhibitions and displays seek to pay tribute to the 2,983 victims of the 9/11 attacks and the 1993 bombing while also educating the public on the September 11 attacks on the World Trade Center, the Pentagon and in Pennsylvania.  (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - MAY 14: Cards, patches and mementos of those killed at Ground Zero are are viewed during a preview of the National September 11 Memorial Museum on May 14, 2014 in New York City. The long awaited museum will open to the public on May 21 following a six-day dedication period for 9/11 families, survivors, first responders, workers, and local city residents. For the dedication period the doors to the museum will be open for 24-hours a day from May 15 through May 20. On Thursday President Barack Obama and the first lady will attend the dedication ceremony for the opening of the museum. While the construction of the museum has often been fraught with politics and controversy, the exhibitions and displays seek to pay tribute to the 2,983 victims of the 9/11 attacks and the 1993 bombing while also educating the public on the September 11 attacks on the World Trade Center, the Pentagon and in Pennsylvania.  (Photo by Spencer Platt/Getty Images)

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