This photograph shows tents on the grounds of Fort Ancient used by work crews exploring the site and building improvements, Warren County, Ohio, ca. 1900-1908. The Fort Ancient Earthworks are a series of earthen embankments that extend for more than three and one half miles around a high bluff along the Little Miami River in southwestern Ohio. Although it is called a "fort," it probably never served as a defensive work. Ditches are located inside the walls rather than outside as might be expected in a fortification. There are more than 60 gateways in the walls, making it difficult to defend the site against enemies. The Hopewell culture (100 B.C. to 500 A. D.) of prehistoric American Indian people constructed the earthworks. Later native ...