I haven’t been here (yet).
Gochang, Hwasun and Ganghwa Dolmen Sites
The prehistoric cemeteries at Gochang, Hwasun, and Ganghwa contain many hundreds of examples of dolmens - tombs from the 1st millennium BC constructed of large stone slabs. They form part of the Megalithic culture, found in many parts of the world, but nowhere in such a concentrated form. [source]