The Cave of Theopetra

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.

The biggest cave system in the Arabian Peninsula is home to a rare variety of blind fish.

One of the largest private collections of fossils in the world.

View Kentucky's beauty and history from the perspective of painter John James Audubon, author and illustrator.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

The caves are the oldest surviving structures in the city of Pune.

A tiny town’s tiny museum with some gigantic residents.