A vertigo-inducing look down from the pinnacle of the world's tallest -- and probably most beautiful - atrium in the Burj al Arab hotel.

It used to be that the world's tallest "this" and biggest "that" were all to be found in the U.S. Not anymore. Especially not with the world's tallest building, which, when it's completed, will be the Burj al Dubai. The world has changed forever.