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Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia

Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

A man exploring the old abandoned Coniston copper mines in the Lake District, Cumbria, England, United Kingdom, Europe

A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.