2 of 19: Shown in this combo image are two documentations of the September 11, 2001, terrorist attack in New York City and the current day location. (Top) Smoke rises into the sky following the collapse of World Trade Center Towers Tuesday, Sept. 11, 2001 in New York. (Below) The skyscraper known as One World Trade Center rises in lower Manhattan, Aug. 10, 2011 in New York. (AP Photo/ Suzanne Plunkett (Top), Mark Lennihan (Bottom)) (Photo/Mark Lennihan)

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