The Sahara Desert, now the largest hot desert on Earth, was once dramatically different. Geological evidence from caves in southern Morocco shows that the region received far more rainfall thousands ...

Deep inside Puerto Rico’s caves, a snake hangs silently from the ceiling, waiting. With perfect timing, the Puerto Rican boa lunges mid-air to snatch flying bats. How does this unusual hunting trick ...

In a cave in Romania, scientists found a bacterial strain entombed in ice that is resistant to 10 modern antibiotics. But it may also help fight superbugs.

Archaeologists have found a prehistoric human skeleton deep inside a flooded cave system on Mexico’s Caribbean coast.

This little-known park has miles of underground caverns, some of which are normally open for tours (in real life and virtually), plus hiking trails to explore.

The oldest physical remains of sewn clothing have been discovered in an Oregon cave, representing a vital turning point in the development of human culture.

Under a Trump order, Mammoth Cave National Park and others are flagging signage and exhibits about slavery for review and ...

This hidden Arkansas cave trail takes adventurous hikers deep underground to a breathtaking waterfall hidden inside a ...