After the first day of trekking, the team set up camp in the vast opening of Hang En ... down through a hole in the cave roof, illumining the underground world. Filming this natural lightshow ...

If you've always wanted to live somewhere a little different, take inspiration from these incredible cave homes ... beautiful cavernous homes in the world ...

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?

Take an otherworldly journey through Hang Son Doong, the world's largest cave located in Vietnam. The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan ...

Sistema Sac Actun, the world's largest underwater cave system, spans an impressive 215 miles. This subterranean network of tunnels and crystal-clear waterways is a geological masterpiece with ...

Expedition leader Andy Eavis accesses a small algae-covered cave opening. He has been studying ... and for a decade afterward it stood as the world’s largest known cave passage.

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 ...

In 2009, it was explored and confirmed by the British Cave Research Association as the largest cave in the world. Since its discovery, Son Doong has captivated the world with its enormous size and ...

it was explored and confirmed by the British Cave Research Association as the largest cave in the world. Since its discovery, Son Doong has captivated the world with its enormous size and unique ...

This video shows a group of tourists taking a tour an ice cave underneath Vatnajokull glacier in Iceland. The glacier expands for 3,100 square miles and it is the largest in the country.