More than two centuries after Europeans settlers arrived in Kentucky, explorers are still discovering unknown caves and passageways in Western Kentucky. This geological marvel is the largest known ...

Forest rangers in Quang Tri Province, home to world's largest cave Son Doong, have discovered a pristine cave with colorful ...

India's caves are thousands of years old. Some date back to the Stone Age. The earliest people to use caves were from the Mesolithic period. They lived in rock shelters and painted scenes from daily ...