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Mammoth Cave National Park, Central Kentucky, USA. The longest known cave system in the world. There are over 400 miles of caves that have been explored.

Mammoth Cave National Park, Central Kentucky, USA. The longest known cave system in the world. There are over 400 miles of caves that have been explored.

Let There Be Light - Son Hang Doong the World's Largest Cave - National Park Phong Mha Ke Bang - Vietnam - by Ryan Deboodt on 500px

Let There Be Light - Son Hang Doong the World's Largest Cave - National Park Phong Mha Ke Bang - Vietnam - by Ryan Deboodt on 500px

Water from Donut Falls, Utah, seeps through a hole in the cave ceiling. The water freezes through the night and thaws through the day during winter.

Water from Donut Falls, Utah, seeps through a hole in the cave ceiling. The water freezes through the night and thaws through the day during winter.

Highlands, North Carolina Dry Falls taken in the cave behind the falls.

Highlands, North Carolina Dry Falls taken in the cave behind the falls.

Wonderful hand carved cave ~ Abiquiu, New Mexico near Ghost Ranch

Wonderful hand carved cave ~ Abiquiu, New Mexico near Ghost Ranch

Bryn Celli Ddu. is a prehistoric site on the Welsh island of Anglesey located near Llanddaniel Fab. Its name means 'the mound in the dark grove'. The Summer Solstice sun lights up a quartz stone at the back of the chamber.

Bryn Celli Ddu. is a prehistoric site on the Welsh island of Anglesey located near Llanddaniel Fab. Its name means 'the mound in the dark grove'. The Summer Solstice sun lights up a quartz stone at the back of the chamber.

Ice cave on the Torre Glacier in Los Glaciers National Park Argentina.

Ice cave on the Torre Glacier in Los Glaciers National Park Argentina.

Halle der Circe Cave, Austria | Photography by ©Peter Gedei

Halle der Circe Cave, Austria | Photography by ©Peter Gedei

✯ Glacier Cave, Alaska

✯ Glacier Cave, Alaska

Blue Ice Cave, Glacier Bay National Park, Alaska

Blue Ice Cave, Glacier Bay National Park, Alaska