Deep inside the world’s longest cave system, scientists have uncovered two terrifying extinct predators that once prowled a ...

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

The world’s longest underwater cave system now stretches an astonishing 524 Kilometers, a hidden labyrinth that, in raw ...

Here’s how to plan a trip to Mammoth Cave National Park.

It dropped down to number two for a while, but more recent exploration confirms Mexico's Ox Bel Ha is officially the longest ...

Step off the desert trail and into Arizona’s longest cave, where crystal formations and subterranean wonders await.

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 ...

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 ...

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 ...