This photograph of Mound City, a prehistoric earthwork complex near Chillicothe, was taken in the 1960s. The thirteen-acre site contains 23 Hopewell burial mounds. Although destroyed by excavations, the mounds were reconstructed in the 1920s and designated Mound City Group National Monument on March 2, 1923. In 1992 it became part of Hopewell Culture National Historical Park, which also includes four other sites in the region: High Bank Works, Hopeton Earthworks, Hopewell Mound Group, and Seip Earthworks. The photograph measures 2.75" x 2.75" (6.99 x 6.99 cm). From about 200 B.C. to A.D. 500, the Ohio River valley was a focal point of the prehistoric Hopewell culture, a broad network of beliefs and practices among different American India...