Montana suggestion help (ND too)

Bannock and Virginia City are very historical and interesting. Bannock was the first capital of Montana and Virginia City is a state historical site and a preserved western ghost town. The are is famous for the Alder Gulch gold rush. It is a reasonable drive from many towns with RV parks. Also, spending a day or two in Butte is great for the mining history. The Copper kings of the time were amazingly wealthy. Touring the mines is a great adventure. Plus, the entire area is rich with Lewis and Clark history, but that usually only takes a few minutes at each location to read the roadside placards. You could also catch a trophy trout or two in the Beaverhead River around Dillon, should the urge strike.