Fossilized bones and teeth dating to 773,000 years ago are providing a deeper understanding of the emergence of Homo sapiens.

Ancient fossils from Moroccan caves, dated with rare precision, offer rare insight into early human evolution.

Peeling back the layers of our Earth’s crust, scientists have unveiled an astonishing underground realm in the United States. This monumental subterranean labyrinth promises not only breathtaking ...

Paul Wilcox descends into Devil’s Canopy Cave on Prince of Wales Island. An unlikely discovery in a cave on Prince of Wales Island could help scientists understand Earth’s climate history. A small ...

Why it's incredible: The cave is so deep, the world's tallest building could fit inside it. The Hranice Abyss — or "Hranická propast," in Czech — is the deepest known freshwater cave in the world.

The marvels of the Grand Canyon extend beyond its dramatic scenery. Underground, vast cave systems hold clues to the region’s ...

Sometimes, a hole in the ground is just a hole. Other times, it’s a portal to an underground cave spanning miles in width and length. You don’t really know what’s inside unless you dive into the void.

A breathtaking geological marvel has been dubbed the "best kept and most breathtaking secret on the planet" - though attempting to visit could prove deadly. The forbidding subterranean cavern, known ...

Below the Chihuahuan Desert in southeastern New Mexico, lies an extensive system of limestone caves, among them the famed Carlsbad Cavern, home to one of North America’s largest underground chambers.