Mammoth Cave National Park is the longest known cave system in the world, and it currently has more than 420 known miles ...

Hidden inside Vietnam’s Phong Nha-Ke Bang National Park is Son Doong, the largest cave on Earth. It’s so vast that a Boeing 747 could fit through its chambers. Inside, jungles grow beneath openings in ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. McGinnis' nail tooth ...

It is Pennsylvania’s largest cave (above or below ground) and is the state’s first entirely underground state park. Have you been there?

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 ...

It’s unlike any other place in Hawaii. The Makauwahi Cave Reserve, located on an undeveloped swath of coastline on Kauai’s south shore, is the largest limestone cave in Hawaii. The cave’s ceiling ...

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 ...