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Woodhenge: prehistoric solar calendar. Cahokia Mounds State Historic Site, 1050–1350 CE, Illinois, USA.

Woodhenge was a prehistoric solar calendar built from 1100 to 1200 CE. Cahokia Mounds State Historic Site preserves the largest prehistoric Native American city north of Mexico. Cahokia existed circa 1050–1350 CE, in what is now southern Illinois between East St. Louis and Collinsville, across the Mississippi River from modern St. Louis, Missouri, USA. The present park contains about 80 manmade earthen mounds, but at its apex around 1100 CE, Cahokia included about about 120 mounds and covered 6 square miles (16 km2) with a population briefly greater than contemporaneous London. Cahokia was the largest and most influential urban settlement of the Mississippian culture, which developed advanced societies across much of what is now the central and southeastern United States, beginning 1,000+ years before European contact. Cahokia Mounds is one of 24 UNESCO World Heritage Sites within the United States, and is the largest archaeological site north of the great pre-Columbian cities in Mexico. This image was stitched from multiple overlapping photos.

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1909US1-2395-96-Pano.jpg
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2019 Sep 4-Oct 20 all: RV to WY, NE, IL, CO, UT, USA: Illinois: Cahokia Mounds State Historic Site
Woodhenge was a prehistoric solar calendar built from 1100 to 1200 CE. Cahokia Mounds State Historic Site preserves the largest prehistoric Native American city north of Mexico. Cahokia existed circa 1050–1350 CE, in what is now southern Illinois between East St. Louis and Collinsville, across the Mississippi River from modern St. Louis, Missouri, USA. The present park contains about 80 manmade earthen mounds, but at its apex around 1100 CE, Cahokia included about about 120 mounds and covered 6 square miles (16 km2) with a population briefly greater than contemporaneous London. Cahokia was the largest and most influential urban settlement of the Mississippian culture, which developed advanced societies across much of what is now the central and southeastern United States, beginning 1,000+ years before European contact. Cahokia Mounds is one of 24 UNESCO World Heritage Sites within the United States, and is the largest archaeological site north of the great pre-Columbian cities in Mexico. This image was stitched from multiple overlapping photos.
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