The Adams County Historical Society seeks to preserve and share the history of Adams County, PA, and its people. To this end, the society operates a museum, located within the dormitory of the first U.S. Lutheran seminary, founded in 1826. The building later served as a Civil War hospital. Exhibit topics include iron works, social classes, pre-history, county development between 1745 and 1945, the Civil War and Battle of Gettysburg, mortuary equipment and mourning practices, religion, education, children's toys, furniture making, seminary history, and circa 1900 dorm life. Other holdings include more than 200,000 photographs and negatives, manuscripts, and county records.
The society offers exhibits, guided museum tours, guided behind-the-scenes tours, research library access, and research services. Appointments are required for all tours to ensure docent availability, with tours only being offered to groups of 10 or more. Students and members may use the research library free of charge. A fee is charged for research conducted upon request.