By Jonathan Davies

The World Trade Center has re-opened for business more than 13 years after the 9/11 attacks when more than 2,700 died.

US publishing giant Conde Nast began moving in with around 150 of the firm's 3,400 staff working from newly built One World Trade Center today (Monday). Around 3,000 Conde Nast staff will be based in the tower by early 2015.

Businesses and organisations are set to start moving into the building this week and over the coming weeks.

The new World Trade Center has been built in the centre of 'Ground Zero' where the old 'Twin Towers' stood. The 104 story tower cost $3.9 billion to build and overlooks the National September 11 Memorial & Museum.

The Port Authority of New York and New Jersey, which owns the building, said it is the most secure building in the world.

Patrick Foye, executive director of the Port Authority, said: "The New York City skyline is whole again, as One World Trade Center takes its place in Lower Manhattan.

"[It] 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 neighborhood [sic]."

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