If you're ever traveling Interstate 90 in South Dakota and you wonder if it's worth stopping for, I'd say yes. An Erskine, a Rockne, Lark, GT Hawk and a '64 Avanti, among others, and an original Stude dealer neon sign, etc, etc. Lots of other orphan make stuff too.
My wife and I stopped there in the early 90's last time and we were stunned with the selection but surprised how some cars sat just under an open carport type set up. Since then, almost all of the cars have been moved inside more protective pole buildings. Quite a collection, with many other interesting antique items too.