Mammoth Cave National Park, home to the world’s longest known cave system, stretches for more than 680 kilometres, and ...

Divers in Mexico's Yucatan Peninsula say they have discovered the world's largest underwater cave. Underwater archaeologists discovered last week that the cave system known as Sac Actun, located near ...

Some caves are small and tight — this one is the opposite. This river cave is so massive it feels like an underground world, with water still flowing through it like a hidden highway. The deeper it ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: iStock A cave once known only to hunters and explorers is now helping to stabilize livelihoods for communities in ...

The largest cave in the USA isn’t just a cave - it’s an underground world that feels endless. Massive chambers, towering ...

Deep beneath the tropical forests of the Yucatán Peninsula lies a vast subterranean domain few people can explore. Accessible by sinkholes known as “cenotes” and potentially stretching across ...

A rare bite into the past. The fossilized tooth of a newly discovered ancient shark species – dating back about 340 million years – has been unearthed in the world’s largest cave system, officials ...

BILLINGS — Access to one of Montana’s largest caves used by bats for winter hibernation could be reopened to explorers under proposals drafted by the Bureau of Land Management. As proposed, the agency ...