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The Atlas/Illinois/Cahokia Mounds State Historic Site

Cahokia Mounds State Historic Site

A UNESCO World Heritage Site at 30 Ramey St, Collinsville, IL 62234, eight miles east of downtown St. Louis off I-55/70 and I-255. The pre-Columbian city of Cahokia reached a population of nearly 20,000 around 1100 AD and covered 4,000 acres with roughly 120 earthen mounds. The 100-foot Monks Mound is the largest pre-Columbian earthwork north of Mexico. Grounds are free and open dawn to dusk daily. The Interpretive Center lobby (restrooms, gift shop, site model) is open Wednesday–Sunday, 9 am–3 pm.

Illinois
Region
Attraction
Stop type
Standalone stop
Atlas
// Why riders stop

Free admission and open daily — easy add to a St. Louis-area ride or the southern end of IL-111. The scale of Monks Mound surprises every first-time visitor. Strong stopping point for riders coming off the Meeting of the Great Rivers Scenic Route.

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