National Park · Kentucky
Mammoth Cave National Park
The longest known cave system on Earth
StateKentucky
Best seasonYear-round (tours)
Don’t missA ranger-led cave tour
TerrainVast limestone cave & green hills
Mammoth Cave protects the longest cave system known anywhere — over 400 mapped miles of passages beneath the Kentucky hills, explored on ranger-led tours. Cool underground year-round; the surface is nicest spring and fall.
What to see
- Historic Tour
- Frozen Niagara
- Domes & Dripstones Tour
- Green River
- Surface hiking trails
Check the park’s official site for current entrance fees, timed-entry or permits, road and seasonal closures before you go.