Point Lobos Ave, San Francisco, CA, United States
Dr. Adolph Sutro built the baths in the late 1800s to provide a diversion for local families. The four pools were housed under a giant glass dome, with room for 25,000 swimmers and spectators, as well as Dr. Sutro's collection of artifacts. Ruined by fire and earthquake, the foundations are still around for daring people to explore. Fog adds to the surreal quality of the ruins.