This volcanic island in Korea -- it's on the UNESCO World Heritage Site list -- has mountains, stunning coastal rock formations and the finest system of cave lava tubes in the world.The Jeju caves have towers of petrified lava, while the Cheju-do cliffs have tube-like formations similar to the Giant's Causeway in Northern Ireland.
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| Jeju Island |
Jeju Island Lava Tubes - South Korea
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