Cahokia Indian Mounds in Collinsville, IL is a UNESCO World Heritage Site as the largest prehistoric Indian site north of Mexico covering about 4000 acres and included at least 120 mounds. The mounds were made of earth dug from pits with stone and wood tools, and transported in baskets on people's backs. It is estimated that over 50 million cubic feet of earth was moved for mound construction alone. "Monks Mound" is the largest prehistoric earthen construction in the Americas, containing an estimated 22 million cubic feet of earth. The base covers more than 14 acres, and rises to a height of 100 feet. A massive building once stood on the summit where the principal chief would live, conduct ceremonies, and govern.
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