As far as hidden gems go, Emerald Cave certainly qualifies. It’s a small grotto carved from the rocky walls of a canyon on the Colorado River in northwestern Arizona that can only be reached by a boat ...

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

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 ...