Dangcheomul Cave [UNESCO World Natural Heritage]

Dangcheomul Cave is a lava tube belonging to the Geomunoreum Lava Tube System, estimated to have formed approximately 320,000 years ago. Despite being a lava tube, it is characterized by the development of secondary formations similar to those found in limestone caves due to the calcareous components of the shell sand on the surface. Inside the cave, unique geological landscapes can be seen, including icicle-shaped stalactites, stalagmites, and columns formed where they meet. As there is no entrance, the cave's interior remains perfectly preserved.