Gwongeumseong, Fortress ruins in Seoraksan National Park, South Korea

Gwongeumseong is a set of fortress ruins on a mountain inside Seoraksan National Park, near Sokcho in Gangwon Province, South Korea, sitting at around 800 meters above sea level. What remains today are sections of stone walls and foundations spread among large natural rock formations on the mountainside.

Gwongeumseong is believed to have been built during the Goryeo Dynasty, possibly in the 13th century, a period when Korea faced repeated invasions from Mongolia. The fortress likely served as a military outpost to defend the region before it was eventually abandoned.

The name of the site comes from a local story about two generals, Gwon and Kim, who used this place as a refuge. Visitors today walk slowly among the old stones and often stop at the remaining walls to look out over the mountains and the coast.

The site is reached by a cable car that brings visitors partway up the mountain, followed by a short walk to the ruins. Access can be restricted during certain seasons, particularly in spring and late autumn, due to forest protection rules.

The large natural boulders on the mountain were not cleared away but were incorporated into the fortress walls, making it hard to tell where the rock ends and the man-made structure begins. This blending of natural stone and built wall is one of the more unusual features of the site.