Venturing alone into the depths of a remote cave is already a challenge—but what he found inside made this journey even more surreal. Hidden deep underground were mysterious blue holes, glowing eerily ...

This is unlike anything we’ve ever seen before! Deep in the wilderness, we stumbled upon a massive cave, but what made it ...

With high carbon dioxide, low oxygen and no photosynthesis, here’s how an entire ecosystem persists in Movile Cave, one of the most extreme environments on Earth.

VAIL, Ariz. — Exciting things are happening at Colossal Cave for the first time in decades. The team there has uncovered a ...

The winter months have provided hikers with the rare chance to explore ice caves carved by melting ice on a glacier in ...