There is a cave in the world which has its own ecosystem. This cave has a forest, river, rocks, trenches and much more. It was declared the world's largest cave in 2009.

the longest cave system in the world. Mammoth Cave is a treasure trove for ancient fish fossils, with more than 70 different species identified within its walls, according to a 2024 study ...

the sound can be heard anywhere from within the cave system, which covers about 64 acres (260,000 square meters). That makes it the largest musical instrument in the world. We’ll save the ...

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

Connecting the two would create a “super system,” one of the longest ... and for a decade afterward it stood as the world’s largest known cave passage. In 1991 a cave discovered in Vietnam ...

For just a few weeks a year, sunbeams shine two hundred metres down through a hole in the cave roof, illumining the underground world. Filming this natural lightshow successfully relied on it ...

The Camuy River flows through the third largest cave system in the world — so extensive, in fact, that it underlies parts of three towns: Camuy, Hatillo, and Lares. Accessible via the main ...