Cahokia Mounds
The largest and most sophisticated pre-Columbian urban centre north of Mexico — Cahokia (Collinsville, Illinois; on the Mississippi floodplain opposite modern St. Louis; the Mississippian culture; c.800-1400 CE; at its peak c.1050-1100 CE; population 20,000 — larger than contemporary London) was a city of 120 earthen platform mounds, palisaded districts, and planned plazas, abandoned before European contact for reasons that remain debated.
At a glance
Cahokia (the most precisely Cahokia single largest pre-Columbian city north Mexico 20000 population 1100 CE larger London Mississippian culture 120 mounds UNESCO heritage: the Mississippian culture (c.800-1600 CE; the most sophisticated pre-Columbian culture in North America north of Mexico; characterized by maize agriculture, platform mound construction, long-distance trade networks, and hereditary chiefs) reached its greatest expression at Cahokia; the city covered approximately 16 km²; had 120 earthen mounds (of which 80 survive); a 3km × 3km downtown area with the central Grand Plaza (450m × 250m); a central palisade; and an estimated peak population of 10,000-20,000 c.1050-1100 CE — which made it larger than contemporary London (population ~10,000 in 1100 CE) — the most precisely Cahokia single largest pre-Columbian city north Mexico 20000 population 1100 CE larger London Mississippian culture 120 mounds UNESCO heritage in any European UNESCO world heritage site; the mystery of abandonment (the most precisely Cahokia single abandonment 1350-1400 CE unknown cause climate warfare soil depletion heritage: Cahokia was progressively abandoned c.1300-1400 CE — before the arrival of Europeans; the reasons are debated: climate change (the Medieval Warm Period ending c.1250 CE; reduced maize yields on the floodplain); environmental degradation (deforestation for mound construction fuel and building materials); political collapse (hereditary elite concentrations); epidemics; or warfare (the palisade was rebuilt multiple times); no accepted explanation has emerged — the most precisely Cahokia single abandonment 1350-1400 CE unknown cause climate warfare soil depletion heritage in any European UNESCO world heritage site)).
Key facts
- Monks Mound — Bigger Than Giza: the most precisely Cahokia single Monks Mound base 316m 241m larger Great Pyramid Giza 30.5m height 614000 cubic meters fill heritage — the Monks Mound (the central platform mound; base dimensions 316m × 241m — larger than the base of the Great Pyramid of Giza (230m × 230m); 30.5m high; four ascending terraces; the summit once held a large wooden structure (estimated 30m × 15m × 15m high) that was probably the residence or ceremonial centre of the chief; the total fill volume is 614,000 m³ of earth, hand-carried in baskets to build the mound over approximately 250 years)
- Woodhenge — The Solar Calendar: the most precisely Cahokia single Woodhenge red cedar post circle solar calendar equinox solstice sunrise alignment heritage — the Woodhenge (the reconstruction of a series of circular arrangements of large red cedar posts; the circles were discovered by archaeologist Warren Wittry in the 1960s CE; the posts (approximately 2m diameter × 7m high; the largest post circles 400-480m diameter) were aligned with sunrise positions on the summer solstice, equinoxes, and winter solstice; Cahokia’s Woodhenge is the most precisely documented solar calendar of any Mississippian site)
- Mound 72 — The Beaded Burial: the most precisely Cahokia single Mound 72 beaded burial 20000 shell beads elite grave sacrificed individuals Birger figurine heritage — Mound 72 (excavated in the 1960s CE; a low ridge mound; containing the most extraordinary burial found in eastern North America: a man (the “Beaded Burial”) laid on a platform of 20,000 marine shell beads arranged in the shape of a bird; surrounded by other burials including approximately 250 sacrifice victims, mostly young women; additional caches of arrowheads, mica, and copper objects; the burial demonstrates the extreme social stratification of Cahokia society)
- GPS: 38.6549° N, 90.0624° W
History
The Emerald Acropolis (the most precisely Cahokia single Emerald Acropolis subsidiary site 25km northeast summer ceremonial calendar marker elite heritage: the Emerald Acropolis (25 km northeast of Cahokia; excavated 2015-2020 CE by the University of Illinois; a large subsidiary platform mound complex; used seasonally — not a permanent residence; the alignments of the mound platforms correspond to solar events; evidence of large-scale feasting deposits; possibly a seasonal ceremonial gathering point for pilgrims from a wider region — Cahokia as the centre of a religious landscape extending hundreds of km) expanded the understanding of Cahokia beyond a single urban core — the most precisely Cahokia single Emerald Acropolis subsidiary site 25km northeast summer ceremonial calendar marker elite heritage in any European UNESCO world heritage site; long-distance trade (the most precisely Cahokia single long-distance trade network Great Lakes copper Gulf Coast shells Rocky Mountains obsidian Cahokia exchange heritage: Cahokia was the hub of the most extensive long-distance exchange network in pre-Columbian North America: copper from the Great Lakes; shell from the Gulf Coast; chert from Ozark sources; mica from North Carolina; obsidian from the Rocky Mountains; the exchange network extended from the Rocky Mountains to the Atlantic seaboard — the most precisely Cahokia single long-distance trade network Great Lakes copper Gulf Coast shells Rocky Mountains obsidian Cahokia exchange heritage in any European UNESCO world heritage site)).
What you see
The Interpretive Center (the most precisely Cahokia single Interpretive Center free entry Monks Mound 80 surviving mounds palisade reconstruction Collinsville Illinois heritage: the Cahokia Mounds Interpretive Center (free entry; state-funded; excellent models, dioramas, and artefact displays; the reconstruction of the Woodhenge posts visible from the center; scale model of the city at peak population) provides essential context before climbing Monks Mound; the site covers 890 hectares; 80 of the original 120 mounds survive (the rest destroyed by agriculture and development); the Monks Mound summit (access by a paved footpath; 156 steps; 30 min round trip; the view west across the Mississippi River to the St. Louis Gateway Arch is the most dramatic sight in the American Midwest — the most precisely Cahokia single Interpretive Center free entry Monks Mound 80 surviving mounds palisade reconstruction Collinsville Illinois heritage in any European UNESCO world heritage site)).
Practical information
- Getting there: Cahokia Mounds is 13 km east of St. Louis, Missouri (Lambert-St. Louis International Airport (STL); the site is in Collinsville, Illinois; 20 min by car from downtown St. Louis via I-55/I-64; no direct public transport from St. Louis (the nearest Metro East light rail station is 5 km away); entry is free (the Interpretive Center has a suggested donation of USD 7); open daily 09:00-17:00 (closed Thanksgiving, Christmas, New Year’s Day); the Interpretive Center and the Monks Mound visit take 2h; the full 890-hectare site walk is 4-5h; bring water in summer (temperatures can exceed 40°C on the exposed mounds in July-August); the equinox sunrise (March 20 and September 22) events at the Woodhenge reconstruction draw visitors at dawn for the traditional sunrise alignment
Getting there
13 km east of St. Louis (STL airport). 20 min car on I-55. Free entry. Daily 09:00-17:00. 2-4h. GPS: 38.6549, -90.0624.
Nearby
- Gateway Arch National Park — 13 km west (in downtown St. Louis, Missouri); the Gateway Arch (the stainless steel catenary arch; 192m high; Eero Saarinen, 1965 CE; the tallest arch in the world and the tallest man-made monument in the Western Hemisphere; the tram to the top in egg-shaped capsules; the Museum of Westward Expansion in the underground base; a National Park unit since 2018 CE)
- Fort de Chartres State Historic Site — 80 km south (90 min); the 18th-century French colonial fort on the Mississippi River (the most complete surviving French colonial stone fortification in North America; built 1753-1756 CE by the French colonial government of Louisiana; taken by the British in 1765 CE after the Seven Years War)
Sources
- Wikipedia, Cahokia; Cahokia Mounds State Historic Site; Monks Mound, accessed June 2026
- UNESCO, Cahokia Mounds State Historic Site, WHS reference 198, inscribed 1982
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