This story is part of a series. View the other stories here. Mountains aren’t just solid stone. Beneath their austere foundation, spaces wind deep into the earth — places people have long explored.

Step into the underground world of caves in the most realistic VR spelunking game, where the entire environment is your map, just waiting to be discovered! Do you love watching footage of secret space ...

There’s a rush that comes with being underground. In dark caves, we explore a world that’s so different from the one we typically inhabit – a thrill that comes from a mix of excitement and risk. While ...

Hazel Barton, a geomicrobiologist at the University of Alabama, fell in love with caving at the age of 14 during an outdoor program. Caving and microbiology remained separate passions until Norman ...