Courageous cave explorers continue to uncover hidden treasures beneath the Earth's surface. From Mammoth Cave in the USA to ...

Sistema Sac Actun is the world's largest underwater cave at 215 miles, a breathtaking labyrinth of nature and history beneath ...

It is one of the Greater Sunda Islands with an area of almost 750,000 square kilometres and a population of more than 23 ...

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 ...

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?

Mammoth Cave is the longest cave system in the world that we know about. More than 400 miles (643km) of the network have already been explored, and geologists believe there’s hundreds more miles ...

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 ...

Explore Mammoth Cave National Park, the longest cave system on Earth, featuring the richest known habitat for cave wildlife in the world. It may be difficult to think of caves as spacious and grand, ...

making it the longest cave in Asia and the third-longest in the world. Follow China.org.cn on Twitter and Facebook to join the conversation.