On March 14, 1896 the Sutro Baths was opened to the public as the world's largest indoor swimming pool establishment. Built on the sleepy western side of San Francisco by wealthy entrepreneur and former mayor of San Francisco (1894-1896), Adolph Sutro, the breathtakingly vast glass, iron, wood, and reinforced concrete structure was mostly hidden in, and literally filled, a small beach inlet below the Cliff House which was also owned by Adolph Sutro at the time. Both the Cliff House and the former Baths site are now a part of the Golden Gate National Recreation Area and operated by the United States National Park Service.

A visitor to the baths not only had a choice of 7 different swimming pools—one fresh water and six salt water baths ranging in temperatures—but could visit a museum displaying Sutro's large and varied personal collection of artifacts from his travels, a concert hall, seating for 8,000, and, at one time, an ice skating rink. During high tides, water would flow directly into the pools from the nearby ocean, recycling the 2 million US gallons (7,600 m³) of water in about an hour. During low tides, a powerful turbine water pump, built inside a cave at sea level, could be switched on from a control room and could fill the tanks at a rate of 6,000 US gallons a minute (380 L/s), recycling all the water in five hours.

The baths struggled for years, mostly due to the very high operating and maintenance costs, and eventually closed. A fire destroyed the building in 1966 shortly after, while in the process of being demolished. All that remains of the site are a labyrinth of cement skeletal remains, blocked off stairs and passageways, and a dark tunnel with a deep crevice in the middle. The Sutro Bath ruins are open to the public, but a warning sign advises strict caution, as visitors have been swept off by large waves and drowned at the site.

Currently, visitors coming to the Sutro Baths from the above parking lot are presented with a sign that describes the history of Sutro Baths starting from its construction and glamorous opening to the public in 1896. Another sign describes the later years of the site's history up until its demolition and complete destruction by fire in 1966. As one walks up out of the ruins toward the historic Cliff House, home to "Sutro’s Diner", "The Bistro", the "Terrace Room", and other dining/reception facilities, one can find other pictures, paintings, and relics from the golden age of Sutro Baths’ functional operation.

Length of baths, 499.5 ft (152 m)
Width of baths, 254.1 ft (77 m)
Amount of glass used, 100,000 ft² (10,000 m²)
Iron in roof columns, 600 tons
Lumber, 3,500,000 ft (1067 km)
Concrete, 270,000 ft³ (7,600 m³)
Seating capacity amphitheater, 3,700
Seating capacity promenade, 3,700
Holding capacity, 25,000
Salt water tanks, 6
Capacity of tanks, 1,805,000 US gal (6,832 m³)
Fresh water, plunge tank, 1
Toboggan slides in baths, 7
Swinging rings, 30
Spring boards, 1
Private dressing rooms, 517
Club rooms capacity, 1,110
Time required to fill tank by waves. 1 hour
Time required to fill tank by pump, 5 hours
Statistics according to a 1912 article written by J.E. Van Hoosear of Pacific Gas and Electric (see full article in External Links: Sutro Baths then).