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Here’s What It Looks Like Under Those Brick Circles In the Street

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Photo via google maps

Those mysterious brick circles you see on streets? They are cisterns — a form of ancient technology adopted after the 1906 earthquake to aid firefighting.

Photo via Scott Kildall

Here’s what they look like underground — pretty cool!

Photo via Robin Scheswohl

SF Water Power Sewer also tweeted this:

But, for reasons unbeknownst to me, the Outer Richmond and Outer Sunset have brick squares instead of circles over the cisterns. San Francisco loves to keep things weird, I guess.

Photo via google maps

Want to learn more about the cisterns? Check out this video below from the Exploratorium.

Sources: SF AWSS, Atlas Obscura, Instructables, Scott Kildall, SF Gate

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Jenna Homen

Jenna Homen

A Bay Area native, Jenna used to live in San Francisco and spent large amounts of her time ruminating on the happenings, history, and idiosyncrasies of San Francisco.