Slick mud covers the walking surface — between two and five feet deep — making paths treacherous. Dunbar Cave is home to the oldest cave art in the U.S., which dates back 800 years.

Cops rushed to Twin Caves in the Blue Springs Recreation Area, Florida after three people were reported missing during a trip. Rescue teams were able to drag two people out of the underwater cave.

The tunnel comes within 15m of another cave, with hopes a path between the two can be found. Cave explorers have pushed through narrow gaps in rocky walls to uncover an extra 100 metres of tunnel ...

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...