Hidden in the darkness of a remote limestone chamber, a cluster of ancient finger marks has forced archaeologists to confront ...

Cave formation starts with a simple chemical reaction between water and carbon dioxide in the atmosphere, creating carbonic acid. This weak acid forms when rainwater combines with CO2, then ...

Horse Cave, Kentucky — The comeback story of the small southern Kentucky town of Horse Cave began far below its streets in the Hidden River Cave, which for decades wasn't the place of wonder it is now ...

Hidden River Cave was once filled with heavy metals and sewage that made the surrounding town smell awful. After a cleanup, it became a tourist draw. The entrance to Hidden River Cave lies just off ...