Arrive at Ellsworth Air Force Base, east of Rapid City. Take an official tour of the base, which includes a stop at a Minuteman missile silo. Next, explore the South Dakota Air and Space Museum, located on base. You'll see bombers, fighters, helicopters and reconnaissance aircraft.
From Ellsworth, travel east on Interstate 90 to Wall for some shopping at a world-famous drug store. Follow Highway 240 south into the mysterious Badlands National Park. This striking, moonlike landscape has a history dating back to the prehistoric era. A variety of fossil remains from saber-toothed cats, ancient pigs, three-toed horses and other prehistoric mammals are buried within the rocks. Explore the park on seven developed hiking trails or backpack in the Sage Creek Wilderness Area. Guided horse-pack trips through this area are available. Stay overnight in Badlands National Park or Wall.