The Crazy Mountain Museum is a historical museum featuring exhibits that reflect the history of Sweet Grass County and the surrounding area. The museum is maintained by the Sweet Grass Museum Society, a non-profit organization. The Sweet Grass Museum Society has its roots in the Pioneer Society founded in the early 1900’s. A permanent home was built and completed 1992 and named Crazy Mountain Museum. The museum has evolved from a display facility located in a building on McLeod Street. In addition to displays, it now includes a research area, including a large master index for individuals mentioned in a wide variety of documents and pictures.