Within the Golden Gate National Recreation Area, just north of Ocean Beach, in San Francisco, you can still find the ruins of what was once the largest indoor swimming pool in the world—the magnificent Sutro Baths. The baths were built by wealthy entrepreneur and San Francisco mayor Adolph Sutro as an addition to his dramatically perched Cliff House, located on the edge of a cliff, overlooking Ocean Beach.
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A postcard of Sutro Baths, circa 1896.
Source: amusingplanet.com