Researchers in Spain have discovered mysterious fossilized facial fragments that belonged to an unknown early human species.

Pushing further into the cave, the team discovered something even more exciting—a “strong thermal inflow and a vast lake” sitting at the bottom of the massive chasm. “In order for Czech ...

While there's so much to do above ground in California, this phenomenal cave invites explorers to venture beneath for an experience unlike any other.

But isolated, untouched areas like the ocean floor, saltwater marshes and the insides of caves hold promise. A thermometer tests the temperature of soil at the bottom of Booming Ice Chasm.