Holy Terror and Hugo Mines in Keystone, SD
Black Hills, west foothills in Wyoming
lol, not in these, but there are some crappy pics tooling around here somewhere.
It's really a great area with loads of attractions, both historical and recreational, many of which are within a few hours of each other. Deadwood/Lead/Homestake, Spearfish Canyon, Devil's Tower, Mammooth site in Hot Springs, Wild Horse Sanctuary....
True. The wagon's ARE contemporaneous to the expedition but they are not from the expedition. The Gordon Stockade, while mostly a re-creation, does include a few cabins from the fort along with replicas. You can enter the replicas but, of course, but the originals are chained off.