Tennessee is home to two major Woodland period (1000 BC – 1000 AD) sites: the Pinson Mounds in Madison County and the Old Stone Fort in Coffee County, both built c. 1–500 AD. The Pinson Mounds are the largest Middle Woodland site in the Southeastern United States, consisting of at least 12 mounds and a geometric earthen enclosure. The Old Stone Fort is a large ceremonial structure with a complex entrance way, situated on what was once a relatively inaccessible peninsula.