One World Trade Center

Associated Press
One World Trade Center, center, rises above the National September 11 Memorial and Museum at the World Trade Center, Thursday, Sept. 6, 2012 in New York. Tuesday will mark the eleventh anniversary of the terrorist attacks of Sept. 11, 2001. The World Financial Center is on the left, and Four World Trade Center is at right. (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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