Avenue Mosaic Steps in San Fransisco, The Sunset. A staircase designed by local artists and put together by more than 300 people from the neighborhood, these mosaic steps (right by Grand View Park) took two years (and lots of hallucinogens) to decorate.
Despite its massive look, this structure is actually easy to assemble, requiring two people less than two hours. Photo courtesy of Fire Stone. This outdoor room is absolutely gorgeous and the fireplace is the main event.