Bison at Wind Cave National Park, South Dakota, USA

Bison at Wind Cave National Park, South Dakota, USA

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 140 miles 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 the United States.