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

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

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 ...

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 ...