A herd of bison grazing on the prairie. A hiking trail stretching between the walls of a canyon. A candlelit descent into a vast network of cave tunnels that almost seems to breathe. This is South Dakota’s Wind Cave National Park. While the landscape, hiking trails, and wildlife watching opportunities above ground are well worth a visit, this is a fantastic national park for underground adventures. Most travel here to see the park’s namesake: Wind Cave. Not only are there unpredictable winds flowing through the cave, the tunnel walls’ unique rock formations are captivating. This place has been a source of fascination for human beings for a long time. According to a Lakota oral history, it’s is an entrance to the spirit lodge, where the first people emerged into the world we know.