The Sutro Baths built in 1894 by Adolph Sutro, conceived a swimming recreational facility for white San Franciscans in a massive glass enclosure housing 7 swimming pools. It appeared to be a spectacle of slides, trapezes, springboards and high dives, with terraced seating for viewing representing a vacation within the city or what Foucault calls a heterotopia of ritual –“a system of opening and closing that both isolates them and makes them penetrable.” [1]
[1] Foucault, Michel. “Of Other Spaces: Utopias and Heterotopias” Architecture/ Mouvement/ Continuite, 1984: 7. (“Des Espace Autres,” March 1967 Translated from French by Jay Miskowiec)
http://www.cliffhouseproject.com/environs/sutrobaths/sutro_baths.htm