Wind Cave National Park, South Dakota
Above ground, this national park in South Dakota is rolling prairie and Ponderosa pine forest inhabited by bison, elk, pronghorns, and prairie dogs, but below lies the world's fourth-largest cave system.
Above ground, this national park in South Dakota is rolling prairie and Ponderosa pine forest inhabited by bison, elk, pronghorns, and prairie dogs, but below lies the world's fourth-largest cave system.