Residents had no idea what lay beneath their neighborhood until a hidden entrance was discovered. Inside a cave below the surface, explorers found a fully concealed house carved into the underground ...

Mammoth Cave National Park, home to the world’s longest known cave system, stretches for more than 680 kilometres, and ...

A hidden cave beneath a residential area revealed a partially built underground house complete with brickwork, plumbing, and electrical systems. The structure extended into natural cave passages where ...

Here’s how to plan a trip to Mammoth Cave National Park.