Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the world’s most fascinating cave systems, each with its own story carved by ...

It’s a claustrophobe’s worst nightmare. Three miles into an overnight research trip through an expansive Tennessee cave, a Vanderbilt student fell so ill he was unable to return, prompting a massive ...

A riverbank cave opened into a massive underground system filled with crystal formations, fossils, and deep water passages.

When the summer sun is blazing, there’s no better way to cool off than by heading underground. Caves offer a naturally air-conditioned escape, along with a chance to explore some of the Earth’s most ...