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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Scientists working in an underground cavern between Greece and Albania have discovered the world’s largest spider web, according ...

A cave once known only to hunters and explorers is now helping to stabilize livelihoods for communities in central Vietnam, near the border with Laos. After strict limits were placed on the world's ...

What is thought to be the world's largest-known spider's web, housing tens of thousands of arachnids, has been discovered in a cave on the Albanian-Greek border. After researchers published their ...