The document summarizes information about three dolmen sites in South Korea - Gochang-Hwasun and Ganghwa - that were collectively designated as a UNESCO World Heritage site. The dolmens are megalithic funerary structures dating back to 7th-5th centuries BC, and they provide insights into the prehistoric cultures that built them. Nearly 40% of the world's dolmens are located across the three sites in South Korea. Specifically, Gochang contains over 440 dolmens and is the largest site, Hwasun has around 500 dolmens, and Ganghwa features earlier dolmen styles situated at higher elevations. For the most part, the dolmens retain their authentic forms