Are These Enormous Mounds Natural or Man-Made?

Name: Are These Enormous Mounds Natural or Man-Made?
Uploaded: 2018-05-15T20:35:42Z
Duration: 1 min 47 s
Description: 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.

From:America's Lost Pyramid

1m 47s
HD
TV-PG

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.