Checked in at Manjanggul Cave

Jeju Island's Manjanggul Cave is the world's longest cave and the longest lava tube, located in the central part of Jeju Island, Korea, to the northeast of Mount Halla. This cave was formed about 2 million years ago from a sea of lava that flowed across the area near Mount Halla. In addition to stalactites and lava stalagmites, the cave also contains other oddly shaped stones as well as hanging stalactites and straight stone pillars. It's definitely a great spot to cool off in the summer!