The 'Cross', left, intersecting steel beams found in the rubble of 6 World Trade Center and a fragment of a trident column, center, one of 84 that formed the exterior structure of each tower are ... more 
The 'Cross', left, intersecting steel beams found in the rubble of 6 World Trade Center and a fragment of a trident column, center, one of 84 that formed the exterior structure of each tower are displayed during a media tour of the National September 11 Memorial and Museum, Friday, Sept. 6, 2013, in New York. Construction is racing ahead inside the museum as the 12th anniversary of the Sept. 11, 2001 attacks draws near. Several more large artifacts have been installed in the cavernous space below the World Trade Center memorial plaza. (AP Photo/Mary Altaffer) less 
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Associated Press | Photo By Mary Altaffer
Fri, Sep 6, 2013 8:12 PM EDT