Boone County Historical Center in Boone, Iowa, is a historic museum building constructed in 1907 as the Champlin Memorial Masonic Temple. It originally served as the home of Mt. Olive Lodge No. 79, a local Freemason lodge, and remained a Masonic temple until 1990, when the lodge relocated. That same year, the building was listed on the National Register of Historic Places. It now houses the Boone County Historical Society, which has preserved the structure while adapting it to serve as a center for local history.