The only known structure in the world to use bauxite aluminum ore as a building material. It was built in 1896 for Dr. Dewel Gann, Sr.; now houses memorabilia, photographs, original office furniture and artifacts; exhibits include Niloak pottery, originally developed in Benton; Quapaw and Caddo Indian artifacts, an area devoted to the aluminum era of Saline County, the Civil War, World War I and World War II.