It seems that you are looking at the biggest rock under the sky. It is said that more than 500 people were required to put up a 6.5 m long megalith on two pillars. It looks like the owner of the grave was a great leader of the tribe. On Ganghwado Island, there are many dolmens along the foot of Goryeosan Mountain. Among them, Bugeun - ri dolmens are the largest. In 2000, it became a UNESCO World Heritage Site.