The Peter Yegen, Jr. Yellowstone County Museum in Billings collects, preserves, researches, and interprets the natural history and diverse cultures fo the Yellowstone Valley of Montana and the Northern Plains. The museum focuses on the prehistory of the plains through the 1950's. Exhibits include materials specific to ten Northern Plains Indian Tribes, western expansion, mining, cattle/sheep herding industries, transportation industries, military (1870-1950's), various medical fields, music, textiles, household goods and personal goods.

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. It is located south of Big Timber on Cemetery Road southeast of the west Interstate exit to Big Timber. 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.

The Gallatin Historical Society, founded in 1977, moved into two rooms in the county jail building in 1979. Built in 1911, the jail was already considered an historic structure. When prisoners were moved to new quarters in January 1982, the county commissioners granted the Society use of the entire building for the Pioneer Museum. Since 1982, the Pioneer Museum has offered a variety of changing exhibits portraying earlier days in the Gallatin Valley. The Society sponsors various programs throughout the year, including the annual History Conference. The Society is also active with an ambitious outreach program, sending exhibits of photographs and artifacts to fairs, banks, schools, and conferences.

The Western Heritage Center is a regional museum that interprets and reflects the life and culture of the Yellowstone River Valley. Located in downtown Billings in the former Parmly Billings Library, which is listed on the National Register of Historic Places, the Western Heritage Center cares for a collection of over 16,000 artifacts, including over 1,000 photographs that document the social history, architecture, public events and the development of the Yellowstone River Valley. Recent oral history projects have focused on interviews with elderly Yellowstone River Valley residents about farming and ranching activities, Crow and Northern Cheyenne women and Deaconess Billings Clinic personnel. This research will be used for future exhibits and publications. Scholars and students of history from throughout the United States have researched our archives and collection. The Western Heritage Press publishes material relating to the Yellowstone River Valley, including books, pamphlets and a guide to historic sites.

Step into history with a one-hour guided tour of the Moss Mansion Historic House Museum. The tour captures early turn-of-the-century life as the Preston Boyd Moss family lived it. Visitors see original draperies, fixtures, furniture, Persian carpets and artifacts displayed in the 1903 red sandstone structure. Designed by the New York architect, Henry Janeway Hardenbergh, designer of the original Waldorf Astoria, Plaza Hotels, Williard Hotel, and Copely Hotel. The home is listed on the National Register of Historic Places and is located in Billings.

This 44-acre museum in Butte, Montana, preserves more than a century of American history and brings it to life. Explore more than 50 structures, ranging from the 100-foot-high headframe of the Orphan Girl Mine to a faithful recreation of a mining town, Hell Roarin' Gulch. Half of the displays focus on the cultural and ethnic history of an 1880s to 1920s mining town, while the other half provides you with a detailed look at the history of mining technology. As one of very few museums to occupy an actual historic mine site, they are uniquely able to portray the story of mining from earliest methods to modern techniques.