Mountain View Cemetery
The dark glass disks on top of this family vault are the lighting technology, common in the days before electricity, known as vault lights. I’ve documented vault lights before in their usual setting: Oakland sidewalks, here and here and here.
Free-standing family vaults tend to use stained-glass windows for illumination, but there’s a row of old vaults that are dug into the hillside where that’s not practical.
Oakland Underfoot 
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