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Inside the new World Trade Center: Tower opens for business 13 years after 9/11

Publishing company Conde Nast began moving on Monday into One World Trade Center, a 104-storey skyscraper that dominates the Manhattan skyline.

The skyscraper - at 1,776ft (541m), America's tallest building - is the centrepiece of the site where the twin towers once stood. (Getty Images)