Slovenian Caves - the Grand Canyon of the underground.

Škocjan Caves, Slovenia - the Grand Canyon of the underground. Škocjan Caves was entered on UNESCO’s list of natural and cultural world heritage sites in Just kidding it's from Lord of the Rings.

Krubera Cave (deepest cave in the world)

Krubera Cave is the deepest known cave on Earth. It is located in the Arabika Massif of the Gagrinsky Range of the Western Caucasus, in the Gagra district of Abkhazia, Georgia

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