Monks Mound
Collinsville, Illinois, United States
Pyramidal mound. Height: 30 m. Date: c. 900/955–1100 CE (construction; Cahokia occupied c. 800–1350/1400).
Platform mound that supported a wooden building on its summit, at the heart of Cahokia. The largest prehistoric earthwork in the Americas (UNESCO). Osmanagich cites Cahokia among pyramid sites without naming Monks Mound.