🇺🇸 United States · Earthwork
Winterville Mounds
Plaquemine Mississippian Coles Creek-Winterville 900–1450 CE · Coles Creek / Plaquemine
16.7 m truncated pyramid center of 23-mound plaza, 1200–1400 CE.
🇺🇸 United States · Ancient village
Wijiji (Chaco Canyon)
Pueblo III; late McElmo revival · Mesa Verde McElmo → Chaco East Wash
Late McElmo eastern great house (30 rooms, 1105–1115 CE) at Chaco Wash narrows — single-wing McElmo revival after main canyon collapse, with check dams.
🇺🇸 United States · Earthwork
Letchworth-Love Mounds Archaeological State Park
Woodland Weeden Island 200–800 CE · Weeden Island (Swift Creek)
14 m platform mound, largest Woodland mound in Florida, 200–800 CE.
🇺🇸 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 · Ancient village
Kin Klizhin (Chaco Outlier)
Pueblo II-III; Chaco outlier · Chacoan McElmo outlier / local Red Mesa synthesis
Southern Wash outlier great house (50 rooms, c.1085 CE) with L-plan and Chaco road causeway — wash-margin agricultural outlier illustrating Chaco emulation.
🇺🇸 United States · Earthwork
Hontoon Island Mounds
St Johns I–II 1000 BCE–1500 CE · St Johns (Mayaou Timucua)
Shell-midden island famous for 6 m buried wooden owl totem (600 CE) and snail-shell ridges.
🇺🇸 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
Toolesboro Mounds
Middle Woodland Hopewell 200 BCE–500 CE · Hopewell (Havana Hopewell)
Iowa's premier Hopewell center: 7 surviving mounds (originally 12) including large conical Mound 2 (8 m high) and linear Mound 7 on blufftop above Iowa-Mississippi confluence.
🇺🇸 United States · Earthwork
Kincaid Mounds State Historic Site
Mississippian 1050–1400 CE (Kincaid phase) · Mississippian (Caborn-Welborn)
19-mound Mississippian town on Ohio River, 1050–1400 CE.
🇺🇸 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
Mann Site
Middle Woodland Hopewell 100 BCE–500 CE · Hopewell tradition
Hopewell ceremonial village on Ohio/Wabash, 100 BCE–400 CE.
🇺🇸 United States · Earthwork
Foster Mounds
Coles Creek 700–1200 CE to Plaquemine 1200–1500 CE · Coles Creek–Plaquemine (Troyville to Mississippian transition Louisiana)
Five-mound complex on Little River near Harrisonburg: largest flat-topped Mound A 8 m high with causeway to plaza, four smaller mounds enclosing 1.5 ha plaza.
🇺🇸 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
Troyville Earthworks
Woodland Troyville culture 400–700 CE peak (with Baytown 100 BCE–400 CE foundations) · Baytown / Troyville-Coles Creek (Woodland to early Mississippian)
Nine-mound complex at Jonesville where 21st Louisiana's tallest pre-Columbian mound (Great Mound, 82 ft) stood until levee leveling. Baytown-Troyville-Coles Creek sequence with plaza and embankment.
🇺🇸 United States · Earthwork
Plum Bayou Mounds
Late Woodland Plum Bayou 650–1050 CE (Baytown-Coles Creek to Mississippian transition) · Plum Bayou (Baytown/Coles Creek, Late Woodland Arkansas)
Premier Late Woodland platform mound center: 18 mounds (tallest Mound A 12 m) enclosing 16 ha plaza with embankment ditch and astronomical causeway aligned to 1-degree solar solstice.
🇺🇸 United States · Earthwork
Etowah Indian Mounds
Mississippian, Etowah phase 1000–1550 CE · Mississippian (Muscogean ancestors)
19-m Mississippian Temple mound with copper falcon plates and marble effigies.
🇺🇸 United States · Geoglyph
Blythe Intaglios
Late Prehistoric 1000–1500 CE (OSL), possibility Protohistoric · Mojave/Quechan; Patayan culture
Mojave giant desert figures: 50-m human intaglios above Colorado River.
🇺🇸 United States · Earthwork
Pharr Mounds
Middle Woodland Miller culture contemporary with Hopewell 1–400 CE · Miller (Hopewell-influenced eastern Woodland); Hopewell
Eight low dome mounds (2–6 ft high) at Natchez Trace Milepost 286.7, best-preserved Middle Woodland mound group in northeast Mississippi.
🇺🇸 United States · Earthwork
Owl Creek Mounds
Late Woodland to Mississippian 800–1200 CE · Late Woodland to Mississippian (Miller to Mississippian transition)
Five platform mounds (6–12 ft high) enclosing rectangular plaza 100×60 m at Owl Creek, Natchez Trace MP 243.
🇺🇸 United States · Earthwork
Poverty Point (Monumental Earthworks of Poverty Point)
Late Archaic 1700–1100 BCE (peak 1500–1200 BCE) · Poverty Point culture
Late Archaic earthwork complex (1700–1100 BCE) with six concentric C-shaped ridges (1.2 km outer diameter) and six mounds, including 22 m-high Mound A – one of largest Archaic earthworks in North…
🇺🇸 United States · Archaeological wonder
Chaco Culture National Historical Park
Pueblo II–III 850–1250 CE (Chacoan fluorescence 1020–1140) · Ancestral Puebloan (Anasazi) / Chacoan
Chacoan canyon with 15 monumental Great Houses (Pueblo Bonito 650 rooms, 35 kivas) and engineered roads, built 850–1150 CE by Ancestral Puebloans as ritual and trade center for San Juan Basin,…
🇺🇸 United States · Earthwork
Seip Earthworks
Hopewell 1–500 CE · Hopewell tradition
121-acre Hopewell circle-square with 335 m Great Circle and Seip-Pricer mound, UNESCO 2023.
🇺🇸 United States · Ancient village
Mesa Verde Cliff Dwellings
Pueblo I–III (600–1300 CE) · Ancestral Puebloan (Anasazi)
Ancestral Puebloan cliff dwellings (600–1300 CE) with 600 sites including Cliff Palace (150 rooms, 23 kivas) under sandstone alcoves, transitioning from pithouses to masonry pueblos before…