Monks Mound (900-1200 AD), largest dirt pyramid in America at Cahokia Mounds World Heritage Site. IL. On National Register.

Monks Mound (900-1200 AD), largest dirt pyramid in America at Cahokia Mounds World Heritage Site. IL. On National Register.
Photo by Jim Steinhart © 2011, all rights reserved. (Ref: ILWC01)

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Cahokia Mounds
Springfield & Western Illinois
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