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Cahokia's Woodhenge: Illinois' Solar Calendar Circles

IntroductionLocated within the ancient city of Cahokia near present-day Collinsville, Illinois, Woodhenge was a remarkable circular arrangement of massive wooden posts that functioned as a prehistoric solar observatory and ceremonial calendar. Constructed between approximately 900 and 1200 CE, Woodhenge formed part of the largest urban center of the Mississippian Civilization, whose population may have reached 15,000 to 20,000 people at its peak…
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The Archaeologist broke the news on Sunday, August 2, 2026.
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