Visitors explore Wind Cave National Park in South Dakota. With 130 miles of explored passages, it is among the world’s longest cave systems and a popular spot for spelunking enthusiasts.

Rocks on Iceland beaches confirm the Late Antique Little Ice Age, caused by volcanic eruptions, precipitated the fall of the Roman Empire.

A small settlement in Greenland is holding its collective breath as an iceberg of titanic proportions drifts dangerously ...

For centuries, humans have lived underground. Today, that ancient practice is under dire threat—even as cave life makes more ...

A trove of prehistoric Ice Age treasures are being exhibited alongside classic works of art to show why they deserve their ...