In the world of archaeology, finding ancient maps or drawings can reveal a lot about how early humans thought and lived. A fascinating discovery in a French cave is giving researchers new insights ...

Findings about the chemical makeup of cave systems can teach us about life in places humans have yet to reach.

The surface of Mammoth Cave National Park encompasses about 80 square miles. No one knows how big the underside is. More than 365 miles of the five-level cave system have been mapped, and new ...