It's a gigantic 28-foot sundial that's located in one of the foggiest neighborhoods of the city - the Ingleside District.
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When it was dedicated in 1913, the real estate developer behind the project touted the white marble and concrete structure was the biggest sundial ever built.
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"When they dedicated the sundial, they did it at night, which was crazy," said David Gallagher, director of the Western Neighborhoods Project, a San Francisco non-profit focused on historical preservation.
Gallagher said the ceremony on October 10, 1913 was bizarre. He called it a "weirdly spiritual event."
The sun dial, located on Entrada Court, was supposed to be a landmark that drew house hunters to what was then San Francisco's newest neighborhood.
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With the Twin Peaks Tunnel soon to open, developers advertised a bedroom San Francisco community with big stately homes for professional white-collar families that was "minutes to downtown" by streetcar.
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The sun dial was supposed to be an attraction to get the public out to the other side of town.
Nowadays, few people - even longtime residents - know of its existence.
"The sundial is one of the west side's best landmarks," Gallagher said. "If you don't know its' there there's no reason for you to pass it."
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