NEW YORK, NY - MAY 15: People watch a live video from the Ground Zero memorial site of the dedication ceremony of the National September 11 Memorial Museum in New York on May 15, 2014. The museum spans seven stories, mostly underground, and contains artifacts from the attack on the World Trade Center Towers on September 11, 2001 that include the 80 ft high tridents, the so-called ?Ground Zero Cross,? the destroyed remains of Company 21?s New York Fire Department Engine as well as smaller items s

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National September 11 Memorial Museum / Davis Brody Bond