4 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) The south tower starts to collapse as smoke billows from both buildings of the World Trade Center in New York. (Below) The skyscraper known as One World Trade Center rises in the lower Manhattan skyline, Aug. 4, 2011 in New York. (AP Photo/ Jim Collins (Top), Mark Lennihan (Bottom)) (Photo/Jim Collins)

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