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🇺🇸 United States · Earthwork
Early Woodland Adena 1000–400 BCE · Adena
Large Adena conical mound (38 ft/11.5 m high, 140 ft/43 m diameter) preserved in Indian Mound Reserve, Enon. One of the best-preserved Adena mounds in Ohio, surrounded by former enclosures now plowed.
🇺🇸 United States · Earthwork
Early Woodland Adena · Adena
Adena conical mound (19.5 ft/6 m high, 95 ft/29 m diameter) preserved as Story Mound State Memorial, encircled by suburban Chillicothe but intact with original ditch.
🇺🇸 United States · Earthwork
Hopewell 100–500 CE · Hopewell tradition
Effigy mound with 136 portrait pipes, Hopewell 100–300 CE.
🇺🇸 United States · Earthwork
Hopewell 1–500 CE · Hopewell tradition
121-acre Hopewell circle-square with 335 m Great Circle and Seip-Pricer mound, UNESCO 2023.
🇺🇸 United States · Earthwork
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland; Hopewell
Cowan Creek — South Causeway Secondary (Ohio) in Ohio, Clinton County, Cowan Creek, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) earthw…
🇺🇸 United States · Earthwork
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland; Hopewell
Newark Octagon — North Avenue Causeway (Licking County) in Ohio, Licking County, Newark, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) e…
🇺🇸 United States · Fortress
Iron Age to Classical (700 BCE–300 CE) · Iron Age fortified culture; Hopewell
Fort Ancient — North Embankment Gateway (Warren County) in Ohio, Warren County, Fort Ancient, United States is a Iron Age to Classical (700 BCE–300 CE) for…
🇺🇸 United States · Earthwork
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland; Hopewell
Hopeton Earthworks — East Wall Gateway in Ohio, Ross County, Hopeton, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) earthwork attributed…
🇺🇸 United States · Temple complex
Early Bronze Age (3300–2100 BCE) · Early Bronze Age
Sanctuary of Wold-Ditch in Ohio, United States is a Early Bronze Age (3300–2100 BCE) temple complex attributed to Early Bronze Age culture.
🇺🇸 United States · Earthwork
Middle Woodland / Late Woodland debated · Hopewell tradition or Fort Ancient tradition
Hilltop stone-walled enclosure 42 ha above Paint Creek; Hopewell vs Fort Ancient debate.
🇺🇸 United States · Ancient city
Late Bronze Age (1550–1050 BCE) · Late Bronze Age
Ancient City of Ness-Rath in Ohio, United States is a Late Bronze Age (1550–1050 BCE) ancient city attributed to Late Bronze Age culture.
🇺🇸 United States · Earthwork
Early Woodland Adena 1000–200 BCE · Adena
Second-largest conical mound in Ohio (65 ft/20 m high, 877 ft circumference) and tallest surviving Adena mound, preserved at Miamisburg Mound State Park.
🇺🇸 United States · Earthwork
Middle Woodland Hopewell 100 BCE–500 CE · Hopewell
Immense Hopewell enclosure 12 ha west of Bainbridge: square (280 m side) attached to circle (320 m diameter) via parallel walls, with ditch-and-embankment 1.5 m high.
🇺🇸 United States · Earthwork
Late Woodland / Fort Ancient 800–1200 CE · Fort Ancient (Late Woodland)
Effigy mound 205 ft/62 m long, 4–6 ft high, head oriented SW tail NE, depicting an opossum/underwater panther effigy on bluff south of Granville. Listed NRHP 1971.
🇺🇸 United States · Earthwork
Early Woodland Adena to Early Hopewell transition · Adena
Adena conical mound (20 ft/6 m high, 100 ft/30 m diameter) preserved in Campbell Park, Columbus — one of few surviving mounds in Ohio's capital city.
🇺🇸 United States · Earthwork
Disputed: either Adena 320 BCE–200 CE or Fort Ancient 1070–1200 CE (latest C14 favors Fort Ancient 1120 CE) · Adena culture or Fort Ancient culture
Quarter-mile (411 m) effigy mound in shape of serpent with oval head swallowing an egg, 3 ft high, coiled tail atop meteor-crater plateau above Ohio Brush Creek, largest surviving effigy mound in…
