Jeju island is full of Mother Nature’s masterpieces.
Many people believe that there’s only one cave on Jeju, However, there are actually eight caves and each telling a different story.
Yongcheondonggul display magnificent structures and boasts an impressive underground lake. Also appear some pieces of earthenware, animal bones, charcoal etc. within the lava tube show that humans lived there, yet when and how humans came to live there remains a mystery.