The pioneer Auto Show is a museum in South Dakota that has been around since 1954. The place is huge and has cars, trucks, motorcycles, tractors, weird gadgets, complete old buildings and much more. Also has a restaurant attached to the museum that serves a killer grilled cheese and fries. The museum is right off of I-90 and there are no less than 1,000,000 billboards telling you the museum is coming up so there is no way in the world you could miss it. Well worth the stop.
http://www.pioneerautoshow.com