Ruined stone building in Cornwall, the UK
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https://lemmy.world/pictrs/image/b64dfdd6-c37f-455b-8143-7afdc8229a49.jpeg
https://lemmy.world/pictrs/image/b64dfdd6-c37f-455b-8143-7afdc8229a49.jpeg
I found it, it's about 1500 meters northeast of Mulfra Quoit, and seems otherwise unremarkable.
Deleted by author
Reverse image search showed it came from a Wikipedia article, which gave (slightly off) coordinates. I was mostly interested to see if there was anything significant about the ruin, but there doesn't seem to be.
To save other people the time:
The EA LiDAR shows a defined southern wall too:
Perhaps too imperialist but I'm too tired for another take.