As home to the longest-known cave system in the world, Mammoth Cave National Park is an especially ... However, the highlight ...

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park ... arduous cave tour (0.25 mile, 75 minutes) is the Frozen Niagara Tour.

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, ...