BAYFIELD, WIS. – Walking atop a frozen stretch of Lake Superior's south shore, Jon Michels paused to look at a 30-foot-tall rippled ice wall cascading over a sandstone cliff cave. Then he noted ...

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

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.

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

A 1550 square km (963 sq mi.) iceberg, designated A81 broke off Antarctica’s Brunt Ice Shelf. A time-lapse of the 'calving ...

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

Closed for more than three years, the boardwalk leading to one of Indian Cave State Park’s main attractions — Indian Cave — has reopened. But with a few changes. Instead of the old series of ...