%% parent:: [[San Francisco]] %% # Cisterns in San Francisco related:: [[Invisible made visible]] Large cisterns are located beneath the streets in [[San Francisco]], marked with large brick-rimmed circles. These are an echoed response to the devastation caused by the [[San Francisco, 1906 earthquake]], making sure that water is accessible to fight fires in an emergency.[^1] ^05ca06 A personal note, I used to live near one of these and I was curious what it was. [^1]: [99 Percent Invisible: Decoding Rings: Beneath the Mysterious Brick Circles on San Francisco Streets](https://99percentinvisible.org/article/decoding-rings-beneath-mysterious-brick-circles-san-francisco-streets/)