By Sky News US Team
Thirteen years after the 9/11 terrorist attack, the resurrected World Trade Center is again opening for business.
Publishing company Conde Nast will start moving on Monday into One World Trade Center, a 104-storey skyscraper that dominates the Manhattan skyline.
Only about 170 of his company's 3,400 employees are moving in now. Still, the opening marks an emotional milestone for both New Yorkers and the nation.
"The New York City skyline is whole again, as One World Trade Center takes its place in Lower Manhattan," said Patrick Foye, executive director of the Port Authority of New York and New Jersey that owns both the building and the World Trade Center site.
The skyscraper - at 1,776ft (541m), the US tallest building - is the centrepiece of the site where the Twin Towers once stood.
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Gallery: One World Trade Center Reaches Full Height
The 1,776ft-tall One World Trade Center towers above buildings in lower Manhattan.
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It is topped with a 400ft silver spire, which was hoisted from the ground...
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... and carefully attached by construction workers.
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Ironworkers cheered as the final piece of the spire was placed on top of the skyscraper.
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Some took photographs to mark the occasion ...
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... while others signed their names and initials on steel girders.
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One World Trade Center is the tallest structure in the US and offers great views across New York City.
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Its height is a nod to the date the US gained independence - July 4, 1776.
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The spire which now tops the tower will serve as a giant broadcast antenna.
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One World Trade Center opens its doors on November 3, 2014.
More than 2,700 people died on 11 September 2001, buried under smoking mounds of fiery debris.
The building's eight-year construction came after years of political, financial and legal infighting that threatened to derail the project. It cost $3.9bn (£2.4bn)
But lower Manhattan has prospered in recent years. Today, about 60,000 more residents now live there - three times more than before 9/11.
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Gallery: Protest At Ground Zero
Relatives of unidentified 9/11 victims are angry at plans to keep the remains in an underground repository at the National September 11 Memorial Museum.
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The remains returned to the World Trade Center site in a solemn procession.
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A police motorcade accompanied the transfer on a foggy morning.
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Firefighters stood saluting the vehicles as they arrived at the site.
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Some protesters wore black bands over their mouths. They demand a say, and insist the remains should be stored in an above-ground monument.
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About 41% of those who died in the September 11, 2001 attacks have not been identified.
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In many cases the remains amount to just fragments of bone.
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The death toll stemming from the attacks at the World Trade Center stands at 2,753.