In this episode of Midwest Shadow Files, we follow the Lewis and Clark Expedition to the mysterious Spirit Mound near present-day Vermillion, South Dakota. Native tribes warned of tiny supernatural beings—known as the "Little Devils of Spirit Mound"—who were said to guard the hill with deadly arrows and strike down anyone who dared approach. Driven by curiosity, Lewis and Clark ignored the warnings and set out to uncover the truth. What they found was a windswept prairie, strange swarms of birds and insects, and a legend that has endured for more than two centuries. Join us as we explore the folklore, Native traditions, and historical mystery behind one of the most intriguing stops along the Corps of Discovery's journey.