Kofun (古墳)

Kofun are enormous (often) keyhole-shaped burial mounds. They are quite remarkable, and now, with online mapping tools, anyone can get a bird's-eye view of them. Who were the originally intended viewers of these giant keyholes? Certainly not imaging satellites flying hundreds of kilometres above the Earth.

I've scoured Japan and here are a bunch of Kofuns: (zoom in and drag the maps around to see more)


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These are near Heijou Palace in Nara.


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These are in Sakai, Osaka.


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These are a bit east of Osaka.


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In Chiba.


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In Osaka.