Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.

Explore Mammoth Cave National Park, the longest cave system on Earth, featuring the richest known habitat for cave wildlife in the world. It may be difficult to think of caves as spacious and grand, ...

During a late January tour of Mammoth Cave, the guide clapped his hands, and the already dim lights went out. He had brought our group to a stop in a flat area – like a small plaza in a hollow s ...

Floyd Collins entered Sand Cave a century ago today to explore its prospects as a visitor site and became trapped in a passageway not much wider than his chest, dislodging a 27-pound rock that pinned ...