One World Trade Center

This 104-story, 1,776 foot-tall building is the Western hemisphere’s tallest skyscraper (and the fourth tallest in the world). Designed by David Childs of the august firm Skidmore, Owings & Merrill, One WTC starts at ground level with a traditional square base, but as it rises, the edges are pared away, yielding a distinctive eight-sided tower composed of a series of soaring isosceles triangles, and topped by a 408-foot spire. Built on the site of the original 6 World Trade Center, the structure formerly known as the "Freedom Tower" includes restaurants and One World Observatory for the public, as well as plenty of commercial office space.