Housed in the lower level of the courthouse, this museum features over 20,000 items from the old west. Permanent exhibits include Indian artifacts, cowboy artifacts and pioneer artifacts dating from 1875. Furniture from original 1888 Courthouse is also included in the exhibits. (The Sundance Kid was on trial here), a Vore Buffalo Jump Diorama and display; a Custer Trail diorama showing the route taken by Custer through
Crook County and the Black Hills and Crook County photographs, brands, and local artifacts.