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Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Neptunes Grotto near Alghero, Sardinia, Italy, Europe
Skocjan caves, UNESCO World Heritage Site, Slovenia, Europe