🇺🇸 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
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 · 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).
🇺🇸 United States · Earthwork
Moorehead Circle at Fort Ancient
Middle Woodland Hopewell (c.100 BCE–250 CE) with Fort Ancient reuse · Hopewell → Fort Ancient
Outer-embankment timber circle 60 m diameter discovered 2007 by magnetometry inside Fort Ancient Hilltop Enclosure (Hopewell 100 BCE–500 CE, later Fort Ancient reuse).