In 1881, Jesse and Tom Bingham heard a whistling noise coming from a beach-ball-sized hole in a rock formation near Hot Springs, South Dakota. Wind was blowing out of the hole, just as it does today, with such force that it blew off Tom's hat. As the story goes, a few days later, when Jesse returned to show the phenomenon to some friends, the wind had switched directions and his hat was sucked in. The hole was the only natural entrance to a cave...a massive one.
We now understand that the movement of the wind is caused by the difference in atmospheric pressure between the cave and the surface. The place was dubbed the Wonderful Wind Cave, before it became only our seventh National Park of the United States. On today's episode of America's National Parks: three eras of Wind Cave National Park: It's first explorer, the Lakota origin story, and a teenager lost for 37 hours. 
Show notes and more info at NationalParkPodcast.com/Wind-Cave