Today I went swimming for the first time in nearly a yr due to a shoulder problem, no these aren't the baths unfortunately. This is a picture in the foyer of my local pool, they are the Sutro Baths the worlds largest indoor baths, built by former mayor of San Franscisco, Adolph Sutro and opened in 1896. The building housing them burnt down in 1966 but apparently you can still see the ruins, now in an area operated by the US national park service.