Carnesville, the county seat of Franklin County, incorporated as a village December 7, 1807. The city remembers Judge Thomas Peter Carnes, a lawyer and Congressman of the Revolutionary War era.
Cromer's Mill Covered Bridge (also known as Nail's Creek Bridge) is located south of the city. Built in 1906, using a town lattice design, the bridge is 136 feet long. Also of historical interest are the Franklin County Historical Society Museum, which features exhibits on local history, and the Franklin County courthouse, which is listed on the National Register of Historic Places.