🇺🇸 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 · Archaeological wonder
Canyons of the Ancients National Monument
Basketmaker II–Pueblo III 1500 BCE–1300 CE (peak 1000–1300) · Ancestral Puebloan (Anasazi, Basketmaker to Pueblo III)
Largest archaeological landscape in US implying 30,000 people: 176,000-acre (71,200 ha) monument with 6,355 recorded sites – villages, cliff dwellings, kivas, towers and shrines from Basketmaker to…
🇺🇸 United States · Earthwork
Marietta Earthworks
Middle Woodland Hopewell (100 BCE–500 CE) · Hopewell (Marietta phase)
Hopewell ceremonial complex (100 BCE–500 CE) at confluence of Muskingum and Ohio Rivers, originally three enclosures: Capitolium Square (150×110 m terraced platform and graded way), Quadranaou double…
🇺🇸 United States · Archaeological wonder
Bandelier National Monument
Ancestral Pueblo III–IV 1150–1550 CE (Pajarito Plateau settlement after Mesa Verde diaspora) · Ancestral Puebloan / Keresan and Tewa (ancestors of Cochiti, San Ildefonso, Santa Clara)
13,355 ha of Frijoles Canyon with tuff cliff dwellings (cavates), mesa-top Tyuonyi Pueblo (400 rooms, 1–3 storeys) and Long House cliff village (800 m long) in soft Bandelier Tuff (1.1 Ma Jemez…
🇺🇸 United States · Megalith
Watson Brake Mound — Ohio Valley (Chillicothe)
Iron Age (1200 BCE–500 CE) · Iron Age
Watson Brake Mound in Ohio Valley, United States is a Iron Age (1200 BCE–500 CE) megalithic attributed to Iron Age culture.
🇺🇸 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
Turtle Mound
Late Archaic to late pre-contact St. Johns II (c.800 BCE–1565 CE, major 600–1400 CE) · St. Johns (Ais/Surruque ancestors)
Largest shell mound in mainland United States—St. Johns II / late prehistoric (600–1400 CE) oyster-shell midden-mound 30 ft high (≈15 m) extending 600 ft long × 180 ft wide (≈183×55 m), volume…
🇺🇸 United States · Earthwork
Stubbs Earthworks
Middle Woodland Hopewell (100 BCE–200 CE) · Hopewell (Little Miami)
Massive Hopewell enclosure at confluence of Turtle and Little Miami Rivers, 700 m long irregular rectangular enclosure (12 ha) with 1.5 m embankments and deep 2 m exterior ditch, featuring timber…
🇺🇸 United States · Earthwork
Monks Mound
Mississippian 900–1200 CE (peak 1050–1200) · Mississippian (Cahokia)
Largest earthen structure in the Americas north of Mexico and centerpiece of Cahokia Mounds State Historic Site.
🇺🇸 United States · Earthwork
Hopeton Earthworks
Middle Woodland Hopewell 100 BCE–500 CE · Hopewell tradition
Hopewell 22 ha circle-square with 321 m Great Circle, UNESCO 2023 unit-of-measure type-site.
🇺🇸 United States · Archaeological wonder
Pueblo Grande de Nevada (Lost City)
Ancestral Pueblo Virgin branch Basketmaker III–Pueblo II · Ancestral Pueblo (Virgin Anasazi / Ancestral Pueblo)
100-room Virgin Anasazi pueblo complex partly drowned by Lake Mead, 300 BCE–1150 CE.
🇺🇸 United States · Earthwork
Old Stone Fort
Middle Woodland 80–550 CE · Middle Woodland (Hopewell-related)
2.75 km stone-walled hilltop enclosure, solstice-aligned, 80–550 CE.
🇺🇸 United States · Earthwork
Fort Walton Mound
Mississippian Fort Walton 1100–1550 CE · Fort Walton (Mississippian Pensacola variant)
Fort Walton culture temple mound on Choctawhatchee Bay, 1100–1550 CE.
🇺🇸 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 · Archaeological wonder
Casa Malpais Archaeological Park and National Historic Landmark
Mogollon–Ancestral Puebloan 1260–1350 CE · Mogollon–Ancestral Puebloan
60-room basalt Great House 1260–1350 CE, Great Kiva solar calendar.
🇺🇸 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 · Archaeological wonder
Hovenweep National Monument
Pueblo III 1200–1300 CE · Ancestral Puebloan
Six Pueblo tower villages 1200–1300 CE, Square Tower.
🇺🇸 United States · Megalith
Bighorn Medicine Wheel
Late Prehistoric 1200–1700 CE · Plains Indians
24 m medicine wheel 28 spokes, solstice alignments.
🇺🇸 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
Watson Brake
Middle–Late Archaic (3500–2800 BCE) · Middle Archaic Watson Brake culture
Oldest North American mound complex: 11 mounds 5400 BP enclosing oval plaza, hunter-gatherer monument without agriculture.
🇺🇸 United States · Archaeological wonder
Walpi Pueblo
Ancestral Hopi (Hisatsinom) to Historic Hopi 900 CE–present · Hopi (Hisatsinom, Hopi-Tewa)
Continuously inhabited 900 CE Hopi terraced pueblo atop 300-m mesa.
🇺🇸 United States · Archaeological wonder
Wupatki National Monument
Pueblo II–III 1120–1250 CE (post-Sunset Crater) · Sinagua / Ancestral Puebloan (Hisatsinom) with Mogollon/Hohokam influences
100-room red-Moenkopi sandstone pueblo with tower-kiva and Hopi-style ballcourt, outlier of Sinagua-Hisatsinom frontier after Sunset Crater eruption (1085 CE) improved farming.
🇺🇸 United States · Earthwork
Shiloh Indian Mounds National Historic Landmark
Early to Middle Mississippian 1000–1350 CE · Mississippian (Shiloh phase)
Palisaded 8-mound Mississippi River town on Tennessee River, 1000–1350 CE.
🇺🇸 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.