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How the Largest Earthwork in the Western Hemisphere Was Built

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»America's Lost Pyramid

How the Largest Earthwork in the Western Hemisphere Was Built

Short | 01:34

Located in southern Illinois, Monks Mound is a massive earthen structure, made entirely of clay, a material that tends to shrink and collapse over time. How, then, has this monument not collapsed?

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Five hundred years before Columbus arrived, a metropolis flourished in North America. It was bigger than Paris and London and featured a towering pyramid that still stands today. What happened to this ancient mega-city and why has it remained one of Western archaeology's best-kept secrets? Using modern technology, we explore this lost empire and reveal its shocking past that marked the dramatic rise and fall of America's first great city.

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