One World Trade Center

Associated Press
An American flag flies next to One World Trade Center, Tuesday, Dec. 11, 2012 in New York.  A 408-foot spire is expected to rise on top of the tower into the Manhattan sky by spring. (AP Photo/Mark Lennihan)

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A spire was fully installed atop One World Trade Center on May 10, bringing the New York City structure to its symbolic height of 1,776 feet. It will serve as a world-class broadcast antenna and also as a beacon to ward off aircraft. The building is at the northwest corner of the site where the twin World Trade Center towers were destroyed in the Sept. 11, 2001, terrorist attacks. (AP)

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