While exploring caves along a riverbank, a group followed a tunnel that quickly led deep underground. The passage opened into massive chambers filled with crystal formations and towering limestone ...

While most people are preoccupied with what’s happening above ground in the Mount Shasta area, very few people think to venture underneath it. With towering mountains, epic hikes, cascading waterfalls ...

The discovery of more than 100 prehistoric structures in the Cova Dones cave in Spain makes it one of the most significant prehistoric underground sites in the world. Archaeologists found stalagmites ...