Goin-dol  /  Dolmen
of Ganghwa-do Goryeo-san
One of Korea's UNESCO World Cultural Heritage Sites
The plains surrounding Goryeo-san host several of the greatest Dolmen of ancient proto-Korea.
This one
(above & below), just off the highway going south from Ganghwa Town, is the most famous of all.
These Megalithic-Bronze-Age monuments have been determined by radio-carbon dating to have
begun in Korea somewhere around 1200 BCE, and to have stopped being made somewhere around
200 BCE.  There are no extant written records about them at-all, and even a curious lack of writings
about them by Joseon Dynasty Neo-Confucian scholars, obsessed with history -- the famous
Shilhak
"Practical Learning" scholars lived (in periods of exile) surrounded by thousands of them in the Hae-
nam region and other parts of South Jeolla Province, and yet did not study/write about them.  Korean
shamans are not known to have conducted rituals at them, surprisingly; some have been utilized by
villages as
Seonang-dang or Protective/Tutelary-Spirit Shrines.  They are mostly assumed to have
been tomb-monuments of tribal chieftains, although some may have been altars for spirit-veneration.
The known history of these Goin-dol do, however, fit perfectly with what we assume to be the truth
about the
Dangun Founding-King myth that stands as the base of "ancient-traditional Korean culture"
as conceived during the 20th Century -- that the Bronze-Age horse-riding invaders originally from
Siberia came in from Manchuria somewhere around 1500-1000 BCE, wiped-out / absorbed the
existing river-coastal Stone-Age tribes, and their culture
(what Koreans like to call Go-joseon) dominated
until the 3rd-2nd Cen BCE when new the Iron-Age influences from China took-over
(Gija, Wiman, the
Han Commanderies & etc), leading to the formation of Korean Iron-Age proto-states (the Samhan & etc) from
the 1st Cen CE onwards to the Three Kingdoms about 400 CE.  The Dan-gun Myth & other writings/
folklore about the legendary Go-joseon do not mention any dolmens, though -- except for two possible
cases:  the "stone altar by the sacred tree" atop Mt. Taebaek-san in the primary myth, and the folk-
belief that "the sons of Dan-gun" built a stone altar on the peak of Ganghwa-do Mani-san.  Remains
of that latter Goin-dol might someday be excavated from underneath the cemented-over remnants of
the Joseon-era watch-platform there today, which is used for shamanic-nationalist ceremonies today.
Bronze-Age objects, similar to those found throughout Manchuria and southern Siberia,
that were found during excavations of Korean Goin-dol before and after 2000 CE.