The Flagg Township Historical Society was formed in 1968 to collect and preserve the history of Flagg Township. Franklin Kruger, the Society's founder proposed the old City and Town Hall be saved from demolition and restored to be used as the Historical Society Museum. The Historical Society began collecting artifacts, photos and documents that reflect the history of Rochelle and Flagg Township that now form the Museum collection. The collection includes thousands of items, many of which are exhibited on all 3 floors of the Museum.