🇺🇸 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 Kingdom · Megalith
Woodhenge & Durrington Walls
Late Neolithic · Grooved Ware
Timber-circle henge (Woodhenge, 6 rings, 168 posts) and Durrington Walls super-henge (500 m diameter, 17 ha, 2 entrances, largest henge in Britain) – contemporary settlement of Stonehenge builders…
🇺🇸 United States · Buried city
Cahokia Mounds
Emergent Mississippian to Stirling phase · Mississippian (Illinoian)
Largest Mississippian centre (650–1400 CE) with 120 mounds including Monks Mound (30 m, 1000x700 ft base, largest earthen platform north of Mexico).