Thirteen years after the 9/11 terrorist attack in which more than 2,700 people died, the World Trade Center reopened for business today.
Magazine publishers Conde Nast were the first to start moving in to the 104-storey, $3.9 billion skyscraper that now dominates the Manhattan skyline.
The building is the centre piece of the 16-acre site where the Twin Towers once stood and where two hijacked planes hit the identical buildings on September 11, 2001 .
"The New York City skyline is whole again, as One World Trade Centre 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 Centre site.
Mr Foye added One World Trade Centre "sets new standards of design, construction, prestige and sustainability.
"The opening of this iconic building is a major milestone in the transformation of Lower Manhattan into a thriving 24/7 neighbourhood.”
The tallest building in the Western Hemisphere, it was originally scheduled to open in 2006, but cost overruns and political infighting caused several delays.