Hidden Commercial Water Tanks in San Francisco – Fire Fighting
Residents of San Francisco and visitors to the city might be surprised by what lies unseen beneath their feet. The clue is some interesting brick or stone circles (or rectangles) found in intersections within the city. Underneath those circles or rectangles are 170 to 200 water cisterns (the number reported isn’t consistent) which function as emergency water cisterns. The reason for the cisterns is found in one word: fire. Read more »
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