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This combo image shows two documentations of the September 11, 2001, terrorist attack in New York City and the current day location. (Top) Pedestrians flee the area of the World Trade Center as the center's south tower collapses following a terrorist attack on the New York landmark Tuesday, Sept. 11, 2001. (Bottom) Pedestrians cross Park Row in lower Manhattan, Aug. 4, 2011 in New York. (AP Photos/Mark Lennihan)
This combo image shows two documentations of the September 11, 2001, terrorist attack in New York City and the current day location. (Top) Pedestrians flee the area of the World Trade Center as the center's south tower collapses following a terrorist attack on the New York landmark Tuesday, Sept. 11, 2001. (Bottom) Pedestrians cross Park Row in lower Manhattan, Aug. 4, 2011 in New York. (AP Photos/Mark Lennihan) AP