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

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

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

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

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

Researchers have discovered the remains of an ancient shark deep inside the world's longest cave system. The newly discovered shark, plucked from the walls of Mammoth Cave in Kentucky, lived around ...

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

Why it's incredible: This massive submerged cave system is among the longest in the world and holds a number of spectacular features and remains. Sistema Ox Bel Ha, meaning "three paths of water" in ...

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 ...

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 ...

The Tentative Lists of States Parties are published by the World Heritage Centre at its website and/or in working documents in order to ensure transparency, access to information and to facilitate ...