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

The Paradise Lost formation is one of the most magnificent inside the Oregon Caves. It's a bit unnerving as you enter the pitch-black darkness, squeezing through one of many narrow corridors inside ...

Dawn Ryan (front), cave manager at Forestville/Mystery Cave State Park in southeast Minnesota's Fillmore County, and Krista McDermid from Zara Environmental during recent research to inventory animal ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SAN DIEGO — Southern California is home to ...

Explore the world's longest known cave system and see colorful, subterranean light displays in these incredible caves that ...

Just three years ago, a group of Idaho men traveled to an unnamed Western state and in an unnamed range of rugged mountains, hiked up a steep trail. At the top, they unraveled climbing ropes, stepped ...

Missouri has a whole other world under the surface of the Earth. Far below the surface of Missouri, a state that is perhaps best known for Kansas City-style barbeque, Anheuser-Busch, and an odd ...

Deep beneath the hills of eastern Spain, scientists stepping into a lightless cavern have stumbled on a world that feels ...

An underground chamber found in Jubilee cave is the largest known in Israel, rising over 10 stories tall beneath Ofra.

LEASBURG, Mo. – A hidden gem thousands of years in the making sits along the banks of the Meramec River in scenic Crawford County. On the northern edge of the Ozark Mountains, Onondaga Cave is one of ...

Cave explorers have traversed what’s now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-metre-deep cave, which they named Delta Variant, in Tasmania’s ...