From Ground Zero to New York rebirth! To celebrate the opening of the One World Trade Center observatory, the Earthcam company achieved a spectacular video that shows the construction of the tower. This time-lapse movie starts with the Ground Zero hole and the introduction of the first benchmarks that indicate the location of the future memorial. Then the construction of One World Trade Center begins and floors rise gradually towards the sky until a worker poses an American flag on top of the antenna. 11 years of work to redraw the new New York skyline!