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A tall, heavy spire was fully installed atop One World Trade Center on Friday, bringing the New York City structure to its symbolic height of 1,776 feet (541 metres). The 124-metre spire was built in part in Canada

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A ‘before’ shot of One World Trade Center in New York is reflected in the Hudson River as seen from Jersey City, New Jersey, May 10, 2013. The final piece of the building's spire was attached Friday morning.Gary Hershorn/Reuters

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Iron workers prepare the final piece of the spire to be attached to the One World Trade Center in New York, May 10, 2013.Lucas Jackson/Reuters

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Workers pose for a photo prior to raising the silver spire atop the One World Trade Center building in New York early Friday May 10, 2013. The 408-foot (124-metre) spire will serve as a world-class broadcast antenna. An LED-powered light emanating from it will be seen from miles away.Mark Lennihan/The Associated Press

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An iron worker reaches out to touch the final piece of the spire before it is placed on top of 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 (541 metres) and helping fill a void in the skyline left by the September 11, 2001 attacks.Lucas Jackson/Reuters

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Iron workers look at names signed inside of the final piece of the spire on top of the One World Trade Center in New York May 10, 2013.Lucas Jackson/Reuters

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Workers prepare to raise the silver spire atop the One World Trade Center building in New York early Friday May 10, 2013.Mark Lennihan/The Associated Press

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Iron workers take photographs as they watch a crane lift the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013.Lucas Jackson/Reuters

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The final piece of spire is hoisted in place on top of One World Trade Center, Friday, May 10, 2013.Mark Lennihan/The Associated Press

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Iron workers wait for the final piece of the One World Trade Center spire in New York, May 10, 2013.Gary Hershorn/Reuters

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A crane places the final piece of the spire on top of 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 (541 metres) and helping fill a void in the skyline left by the September 11, 2001 attacks.Lucas Jackson/Reuters

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Iron workers lean out to secure the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013.Lucas Jackson/Reuters

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The final piece of the One World Trade Center spire is attached to the building by ironworkers in New York May 10, 2013.Gary Hershorn/Reuters

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One World Trade Center stands at its full height above the New York City skyline in this view from the Heights neighborhood of Jersey City, N.J., Friday, May 10, 2013. A 408-foot (124-metre) spire was set into place at the top of the structure Friday, making the building a symbolic 1,776 feet (541 metres) tall.Julio Cortez/The Associated Press

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An iron worker leans on a safety fence to look at the New York skyline after watching a crane lift the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013.Lucas Jackson/Reuters

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A woman walks her dog along the Hudson River, opposite the cityscape of New York, after the One World Trade Center (C) had the final piece of its spire attached, in Jersey City, New Jersey, May 10, 2013.Gary Hershorn/Reuters

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