Trethevy Quoit

One of the best examples of a dolmen to be found anywhere, this one may hold an archaeoastronomical secret, too. Dolmens are perched stone slabs placed atop vertical stone supports. Many are in Portual. A few may even exist on the East Coast of the U.S. This megalithic burial chamber also goes by the name, the Giant's House.
Trethevy Quoit
Trethevy Quoit
Archaeologists believe this structure may have been subterranean when built around 55 centuries ago, but weather has eroded away the original soil. The tilted roof appears to have resulted from a partial collapse sometime in its history. Originally, 7 vertical members supported the capstone. Now there are only 6 that bear the weight of the capstone, estimated at more than 10 tons.
signage
Trethevy Quoit
Trethevy Quoit's archaeoastronomical suggestion is powerful. The capstone's portal window appears near the structure's peak. Though obviously thrown out of intended alignment by the suspected partial collapse, this may have been a sighting hole for a recurring astronomical event, according to some experts.
 
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