The New York skyline stretches into the horizon as seen from the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. [Photo/Agencies]

The final piece of the spire at One World Trade Center is lifted into place in New York, May 10, 2013. [Photo/Agencies]