Jeju, South Korea
Known as the “Hawaii of Korea” thanks to its extraordinary volcanic landscapes, the island of Jeju has been designated a UNESCO Global Geopark comprising multiple natural phenomena. Hallasan National Park is home to South Korea's tallest mountain, a luminescent crater lake and cascading waterfalls along its hiking paths. The astounding multicolored caverns of Geomunoreum are regarded as the finest lava tube system in the world, and the fortress-like volcano of Seongsan Ilchulbong rises dramatically out of the ocean.