This National Park Has the Longest-known Cave System in the World — With Over 400 Miles of Underground Passages, Sparkling Domes, and a Frozen Waterfall

Mammoth Cave National Park in Kentucky, home to more than 400 miles of underground passageways, sees approximately 500,000 visitors annually. Here's the best time to visit, plus where to stay and what to do while there.

May 4, 2025 · 1 min · 139 words · Marcus Johnson

Mammoth Cave National Park in Kentucky has great hiking and kayaking, too.

Courtesy of Mammoth Cave National Park

Its no wonder Mammoth Cave has long drawn visitors to south-central Kentucky.

And while it’s easily the parks biggest draw, it isnt its only attraction.

Historic Entrance of Mammoth Cave in Mammoth Cave National Park

Courtesy of Mammoth Cave National Park

Anglers will find bluegill, catfish, bass, and perch, among others.

There are alsothree developed campgroundsinside the park: Mammoth Cave, Maple Springs, and Houchin Ferry.

The Houchin Ferry Campground is a tent-only campground with a more remote feel.

Canoes on Green River in Mammoth Cave National Park

Courtesy of Mammoth Cave National Park

It’s 20 minutes from the visitor center.

The spring and fall tend to be significantly quieter, while winter is the parks low season.

Cleaveland Avenue in Mammoth Cave National Park

Courtesy of Mammoth Cave National Park

Shower Bath Springs near Frozen Niagara in Mammoth Cave

Courtesy of Mammoth Cave National Park

Mammoth Cave National Park Visitor Center

Courtesy of Mammoth Cave National Park

Interior of Mammoth Cave near Giant’s Coffin

Courtesy of Mammoth Cave National Park