Škocjan caves

Walk along the deepest cave canyon in the world in Škocjan caves, Slovenia

Cave system with numerous unique characteristics: giant, 146 meters deep underground canyon of River Reka, underground travertine terraces, Bronze Age and later temples, and Pre-Christian pilgrimage center.

Bimmah sinkhole

Lake in Bimmah sinkhole, Oman

Approximately 30 m deep sinkhole with a deep blue lake in it. A beloved place for swimming, the best-known sinkhole in Oman.

Le Trou de David

Le Trou de David (image has fisheye distortion) before its collapse, Saint Martin

A former sinkhole at the sea, with two natural arches towards the sea. In calm weather, one could swim into this sinkhole from the sea. Collapsed in December 2011.

Animal Flower Cave

View from Animal Flower Cave, Barbados

Partly submerged cave with yellow sea anemones and beautiful views on the ocean from its entrance.

Hato Caves

Stalactites in Hato Caves, Curaçao

Show caves, with many petroglyphs engraved by Amerindian people, prehistoric burials. Caves are adorned with many stalactites, stalagmites, other dripstone formations. Remnants of extinct animals.

Aripo Main Cave, Trinidad

Biggest cave system on the island, 862 m long. Contains small tufa waterfall. Colonies of oil birds and bats. Six new insect species have been first described in this cave.

Cavannagh Cave

The site where remnants of extinct giant rodent Amblyrhiza inundata were found in the 19th century. This deer-sized animal lived some 125 000 years ago, at lower sea level. It is possible that these remnants were found in other local caves as well.

Boiling Hole in Lake Catherine

A deep cave that starts some meters below the water in Lake Catherine. Explored 206 m long passage, a strong current in the cave.

Grotta dello Smeraldo – Emerald Grotto

Emerald glow in Grotta dello Smeraldo, Italy

Partly submerged cave in Amalfi Coast, Italy. Sunlight enters the cave indirectly – through the seawater and most of the visible spectrum is absorbed. Thus the water in one corner of the cave shines in a beautiful emerald green-blue color.