In this Thursday, Sept. 5, 2013, file photo taken with a fisheye lens, 1 World Trade Center, center, overlooks the wedge-shaped pavilion entrance of the National September 11 Museum, lower right, and the square outlines of the memorial waterfalls in New York. According to the nonprofit Council on Tall Buildings and Urban Habitat, 1 World Trade Center, once completed, will be the third tallest building in the world with a height of 1,776 feet. (AP Photo/Mark Lennihan, File) ( Tallest Skyscraper-Photo Gallery )