The Park is made up of three units, Fort Rosalie is the location of an 18th Century fortification built by the French and later occupied by the British, Spanish and Americans. The William Johnson House was a house owned by William Johnson, a free African American businessman, whose diary tells the story of everyday life in antebellum Natchez. Melrose was the estate of John T. McMurran, a northerner who rose from being a middle class lawyer to a position of wealth and power in antebellum Natchez.