Mammoth Cave, Kentucky, USA, is the world's longest cave system, with over 400 miles of explored passageways. The vast ...

After taking a winding road near Kings Canyon National Park in California, visitors are treated to a striking waterfall and an impressive cavern tour.

A rescue cave diver has described the final moments of a man who died after being unable to escape Utah’s ‘Nutty Putty’ cave while on a spelunking trip.