Deep inside the cave system, explorers encountered a vertical pit plunging more than 600 feet into darkness. The depth, scale ...

Deep underground, flowing water leads explorers into a cave shaped by constant motion and time. The waterfall inside Nash Cave reveals narrow passages, slick rock, and areas rarely documented.

Eighteen cave explorers surveyed more than 3,500 feet of unexplored passages in Wind Cave on Feb. 11, making it the fourth-longest cave in the world. Cavers from Colorado, Nebraska and South Dakota ...

An explorer of the Mammoth Cave system in Kentucky who died 100 years ago is credited with the creation of the national park. A national park in Kentucky has the longest known cave system in the world ...