From Ohio History Central
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Other earthworks in the Chillicothe area include Hopeton, Mound City, Seip Mound and Earthworks, and Story Mound. The Hopeton Earthworks site is recognized as a National Historic Landmark. The site of the Adena Mound, the Hopewell Mound Group, Mound City Group, Seip Earthworks, Story Mound, and other mounds and enclosures near Chillicothe are listed on the National Register of Historic Places.