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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.

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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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