Cahokia Mounds
Site View and Location
Cahokia Mounds
United States
Longitude: -90.062
Latitude: 38.6553
Historical Significance
Cahokia stands as the most sophisticated and largest urban complex in North American prehistory, demonstrating that complex, hierarchical, and densely populated civilisations developed independently north of Mexico centuries before European contact. Its UNESCO World Heritage designation recognises its exceptional testimony to the Mississippian culture's urban planning, ceremonial architecture, and far-reaching trade networks that connected communities from the Gulf Coast to the Great Lakes.
Facts
Fact 1
Monks Mound's Staggering Scale
Monks Mound covers 5.6 hectares at its base — larger than the footprint of the Great Pyramid of Giza — and was constructed entirely without metal tools or draft animals by workers carrying earth in baskets, one load at a time over several centuries.
Fact 2
Woodhenge
Archaeologists have identified at least five large timber circles near Monks Mound, dubbed "Woodhenges," built from massive red cedar posts aligned to mark the solstices and equinoxes — demonstrating sophisticated astronomical knowledge among Cahokia's planners.
Fact 3
Beaded Burial of a King
In Mound 72, excavators found the burial of a high-status individual lying on a bed of 20,000 marine shell beads arranged in the shape of a falcon — accompanied by the mass graves of over 250 sacrificed individuals, mostly young women, in nearby pits.
Fact 4
City Larger Than Medieval London
At its peak around 1100 AD, Cahokia's population of up to 20,000 people made it larger than contemporary London and equal in size to many European capitals of the same era — a fact that challenges traditional narratives of pre-Columbian North America as sparsely populated.
Fact 5
A Planned City
Cahokia was not an organic settlement but a deliberately planned urban centre — its mounds, plazas, and residential areas were laid out according to a precise cardinal grid aligned to the sun, indicating centralised planning authority and sophisticated surveying techniques.
Fact 6
Mysterious Abandonment
By 1350 AD Cahokia was completely abandoned, leaving no written explanation — palaeoclimate data suggests catastrophic flooding of the Mississippi floodplain around 1150 AD triggered a population exodus, while evidence of wooden palisade walls suggests increasing warfare in the city's final decades.