The society's museum includes three buildings. The central building is located on the grounds of the Douglas County Courthouse in Armour and originally housed the offices of auditor and register of deeds in 1902. This building was placed on the National Register of Historic Sites in 1976. In 1981, the society moved an 1884 country school to county property just east of the museum. The third building, known as "The Railroad House," was added in 1988 and is furnished and decorated in the period of the early 1900s. These buildings are open to the public each Friday afternoon and holidays from Memorial Day to Labor Day or any other time by appointment.