One World Trade Center

Workers prepare to raise the silver spire atop the 1 World Trade Center building in New York early Friday May 10, 2013. The 408-foot spire will serve as a world-class broadcast antenna. An LED-powered light emanating from it will be seen from miles away. When it is fully installed on the building’s roof, it will bring the iconic structure to its full, symbolic height of 1,776 feet. (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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