Today the museum and adjoined archives serves as the oldest private collection of books, letters, journals, maps, drawings and photographs in the state. These collections contain records from the pre-colonial period to the present, including both personal and public documents. Additionally, the historical society also owns one of the nation's largest collections of Confederate imprints.
The building that houses the society is the Robert Mills Fireproof Building. Built in in 1872, the building itself is a historical artifact. Robert Mills was the first professional architect born and trained in the United States. Robert Mills worked with President Andrew Jackson and was responsible for designing many important buildings in Washington D.C. One of the most well-known Mills designed buildings is the Washington Monument.
Mills designed the Fireproof building to live up to its name. It was specifically created to protect sensitive and valuable state documents. At the time of its completion, the Fireproof Building was the only one of it's kind in the entire country. It was added to the National Historic Landmark registry in 1973.