Jeju Island's Manjanggul Lava Tube Cave system is one of world's longest, winding nearly 4.6 miles (7.4 kilometers) underground. Step into Manjanggul — a UNESCO World Heritage Site — the 75-foot-tall tunnel (23 meters), adorned with shelves, stalactites, stalagmites and cones, all made of lava, and discover why it's one of the best things to do on Jeju Island.
On Jeju Island's extreme eastern tip, Seongsan Ilchulbong, or Sunrise Peak, draws early risers with a pre-dawn spectacle of rainbow sherbet skies. The dormant volcanic peak is worth climbing any time of day for its views of the sea and Korea's islets. At the top of the steep stairway you can peer into the bowl-shaped crater.
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