Wishlisted by Matt Mayer
Jeju island has been on my wish list for a while and another good reason to go is that its volcanic caves and lava tubes are a UNESCO world heritage site. The caves are some of the largest in the world and will form when molten magma was forced through the rock in the volcanic island.
182 Manjanggul-gil, Gujwa-eup, Cheju, Jeju-do, South Korea
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