Nevertheless, whilst conditions in the cave are ideal for crystals, they are deadly to humans. Humidity stands at more than 90 per cent – a level at which sweating has no cooling effect on the body.

Researchers from the University of Northern Iowa are exploring some of the nation’s deepest caves to learn about life in ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

Crystal Cave, the ancient marble cavern at the end of a steep half-mile hike in Sequoia National Park, is slated to reopen to visitors this summer after four years of closure.The cave features a ...

Under a black light, the chemicals fossilized within shine in brilliant hues of pink, blue and green. Scientists are ... the chemistry in South Dakota's Wind Cave is likely similar to places ...