🇺🇸 United States · Earthwork
Turner Group Earthworks
Middle Woodland Hopewell 100–400 CE · Hopewell tradition (Turner phase)
Hopewell enclosure-mound group source of copper effigies and mica tombs on Little Miami terrace.
🇺🇸 United States · Earthwork
High Bank Works
Hopewell Middle Woodland 100–400 CE · Hopewell tradition
Circle-octagon pair 320 m circle, UNESCO 2023.
🇺🇸 United States · Earthwork
Cowan Creek Circular Enclosure
Middle Woodland / Hopewell (100 BCE – 400 CE) · Hopewell
Cowan Creek Circular Enclosure in Ohio, United States is a Middle Woodland / Hopewell (100 BCE – 400 CE) earthwork attributed to Hopewell culture.
🇺🇸 United States · Earthwork
Serpent Mound — Head Coil North Bend (Adams County)
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland
Serpent Mound — Head Coil North Bend (Adams County) in Ohio, Adams County, Serpent Mound, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) …
🇺🇸 United States · Earthwork
Seip Earthworks — North Circle Ancillary (Ross County)
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland; Hopewell
Seip Earthworks — North Circle Ancillary (Ross County) in Ohio, Ross County, Seip, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) earthwo…
🇺🇸 United States · Earthwork
High Bank Works — Octagon Northeast Corner
Neolithic to Mississippian (3000 BCE–1400 CE) · Neolithic / Woodland; Hopewell
High Bank Works — Octagon Northeast Corner in Ohio, Ross County, High Bank, United States is a Neolithic to Mississippian (3000 BCE–1400 CE) earthwork attr…
🇺🇸 United States · Earthwork
Hopewell Culture National Historical Park (Mound City Group)
Hopewell 1–500 CE (Middle Woodland, peak 100–400 CE) · Hopewell tradition (Scioto Hopewell)
Finest Hopewell enclosure: 13-acre (5.3 ha) flat-topped earthen-walled enclosure (1,211 m perimeter, 1–1.8 m high) near Scioto River enclosing 24 conical, elongated and effigy mounds.
🇺🇸 United States · Hillfort
Ard-Wall Camp
Nazca (100 BCE–800 CE) · Nazca
Ard-Wall Camp in Ohio, United States is a Nazca (100 BCE–800 CE) hillfort attributed to Nazca culture.
🇺🇸 United States · Earthwork
Newark Earthworks
Hopewell culture 100 BCE–500 CE · Hopewell (Adena descended, Algonquian? cohort)
Hopewell giant geometric enclosures marking 18.6-yr lunar cycle.
🇺🇸 United States · Earthwork
Fort Hill Earthwork and Nature Preserve
Hopewell Middle Woodland 100–400 CE · Hopewell tradition
14.6 ha hilltop enclosure 2.4 km wall, 33 gateways.
🇺🇸 United States · Earthwork
Junction Group Earthworks
Middle Woodland Hopewell (100 BCE–500 CE) · Hopewell tradition
Unusual Hopewell (100 BCE–500 CE) enclosure complex at confluence of Paint Creek and North Fork, comprising nine geometric elements—four circles, two squares, crescents and parallel walls—covering 26…
🇺🇸 United States · Earthwork
Lowfield Thwaite Earthwork
Iron Age (1200 BCE–500 CE) · Iron Age
Lowfield Thwaite Earthwork in Ohio, United States is a Iron Age (1200 BCE–500 CE) earthwork attributed to Iron Age culture.
🇺🇸 United States · Earthwork
Enon Mound
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
Story Mound
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
Fort Ancient Earthworks
Hopewell 1–450 CE · Hopewell tradition
Largest hilltop enclosure: 40 ha with 67 gateways, Hopewell 1–450 CE, UNESCO 2023.
🇺🇸 United States · Earthwork
Cowan Creek — South Causeway Secondary (Ohio)
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
Newark Octagon — North Avenue Causeway (Licking County)
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 · Earthwork
Hopeton Earthworks — East Wall Gateway
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 · Earthwork
Spruce Hill Earthworks
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 · Earthwork
Miamisburg Mound
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
Barnes Works
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
Alligator Mound
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
Tremper Mound and Earthwork
Hopewell 100–500 CE · Hopewell tradition
Effigy mound with 136 portrait pipes, Hopewell 100–300 CE.
🇺🇸 United States · Earthwork
Shrum Mound
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.