Sutro Baths was built in the late 19th Century. It was a large swimming pool owned privately by Adolp Sutro, who was a former mayor of San Francisco. It had seven different pools, one having fresh water and the others having salt water, but varying in temperatures. Below the Cliff House, a small beach inlet was filled almost hiding the vast iron, glass and concrete structure. The bath had a high operating cost, due to which it eventually closed and a fire in 1966 almost destroyed it leaving behind the ruins. The ruins of the Sutro Baths are open to the visitors as well as the cave where you can catch a glimpse of bats.