Explore the World’s Longest Cave System at Mammoth Cave National Park: 400+ Miles of Stunning Subterranean Wonders
The idea of another world existing beneath our feet is both thrilling and terrifying — and it’s the reality atMammoth Cave National Park, which has the longest known cave system in the world. The park’s namesake cave runs more than 400 miles under the earth’s surface — and that’s just the part that has been explored and mapped. Inside the aptly named Mammoth Cave, you’ll find tube-like passageways, great rooms with sparkling walls, slot canyons, huge domes, and even a dripstone that resembles a frozen waterfall.