Crystal Cave, the ancient marble cavern at the end of a steep half-mile hike in Sequoia National Park, is slated to reopen to ...

Researchers use a portable fluorescence spectrometer to analyze the glowing formations in underground caves. Now, researchers ...

Deep below the Earth’s surface, rock and mineral formations lay hidden with a secret brilliance. Under a black light, the chemicals fossilized within shine in brilliant hues of pink, blue and green.

One of Barbados' most popular attractions is Harrison's Cave Eco-Adventure Park. This limestone cavern features several streams (the stream system is estimated to be at least 1.5 miles long), as ...

Deep inside a labyrinthine cave in southwestern France, ancient humans who lived around 30,000 years ago carved horses, ...

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 ...