The Koreshan State Historic Site is a state park in Estero, Florida located on U.S. Highway 41 at Corkscrew Road. It was also added to the National Register of Historic Places on May 4, 1976, under the designation of Koreshan Unity Settlement Historic District. It contains areas of pine flatwoods habitat and the site of a religious colony, the Koreshan Unity, whose last members deeded the land to the state in 1961.