5. 8 Spruce Street, New York
Part of the lower Manhattan architectural renaissance that followed the 9/11 terrorist attacks, 8 Spruce Street opened in early 2011 as the tallest residential tower in the Western Hemisphere at a height of 870 feet (76 stories). But even more striking is its unique stainless-steel façade, comprised of undulating panels that form a skyscraper unlike any other in a city filled with them. Although "starchitect" Frank Gehry gave the tower, his first skyscraper, the metallic, shape-shifting design for which he's famous, the developer's "value engineering" alteration after the 2008 recession left the building's south side totally flat. Still, 8 Spruce Street remains one of the country's coolest towers — at least on three sides.