Along with underground adventures, Mammoth Cave National Park in Kentucky offers great hiking and kayaking, too.

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 ...

Explore the stunning Son Doong cave in Vietnam, which is so vast it requires a four-day trek to explore fully. This ...

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 longest cave system in the world is named, rather fittingly, Mammoth Cave. Found underneath Kentucky’s Mammoth Cave ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...