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Are These Enormous Mounds Natural or Man-Made?

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From: Secrets
»America's Lost Pyramid

Are These Enormous Mounds Natural or Man-Made?

Short | 01:47

Speculation abounds as to whether the mysterious Cahokia mounds in southern Illinois were naturally formed or created by an ancient people. Now, archaeologists are putting its origins to the test.


More About This episode

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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