World Trade Center spire

The final piece of the spire is hoisted to the roof of One World Trade Center in New York, capping the tower at 1,776 feet.

The final piece of the spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

The final piece of the spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

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