One World Trade Center opens for business in New York
More than 13 years after the original towers were destroyed in the 9/11 attacks, New York's World Trade Center has re-opened for business.
Employees at publishing giant Conde Nast are starting to move into the 104-storey One World Trade Center.
The $3.8bn (£2.4bn) skyscraper took eight years to build and is now the tallest building in the US.
It is at the centre of the site, which includes a memorial in the footprints of the old towers and a museum, which opened this year.