Bison at Wind Cave National Park, South Dakota

Bison at Wind Cave National Park, South Dakota

Hidden below the prairie at Wind Cave National Park, you’ll find something unexpected: one of the longest caves on the planet. This site includes 225 kilometres of explored passageways, making it the sixth-longest cave in the world, and the first cave to ever be established as a national park. What’s above ground is equally special. The prairie supports one of the most genetically pure herds of bison in America.