Check out New York's World Trade Center site before and after the Sept. 11, 2001, attacks, and the memorial.
Construction continues on One World Trade Center tower (R) at the World Trade Center site, March 17, 2011. When completed, One World Trade Center will reach 104 stories.
iStock / mocker_bat
Michael Saechang/Wikimedia Commons
Washington State National Guard
iStock / diego_cervo
iStock / DeshaCAM
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