Mounds State Park, located off I-69 east of Anderson, features 10 unique "earthworks" built by a group of prehistoric Indians known as the Adena-Hopewell people. The largest earthwork, the "Great Mound", is believed to have been constructed around 160 B.C. Archaeological surveys seem to indicate it was used as a gathering place for religious ceremonies. Be sure to include time to visit the new Nature Center. The new building includes a bird viewing room, small animal displays and much more.