Spirit Mound is a 1.15 km hiking trail near Vermillion, South Dakota, reaching an elevation of 364 meters on the historic Lewis & Clark National Historic Trail. This short but significant hike takes you across native prairie grasslands to a sacred mound visited by the famous expedition in 1804, offering panoramic views of the Missouri River Valley and surrounding plains. Hikers can explore 81 immersive trail scenes while experiencing the same landscape and Native American spiritual site that captivated Lewis and Clark over two centuries ago.