Step off the desert trail and into Arizona’s longest cave, where crystal formations and subterranean wonders await.

Seven cheetah mummies recently discovered in an Arabian desert cave have renewed discussion about reintroduction of the animals.

Justin Stewart, an ecologist with the Society for the Protection of Underground Networks, collects a sample of soil containing mycorrhizal fungi taken at Saguaro National Park. Credit: Wyatt ...

Scientists have uncovered a rare discovery in northern Saudi Arabia — the naturally mummified remains of cheetahs preserved inside desert caves for up to 2,000 years. Researchers excavating caves near ...