How the Largest Earthwork in the Western Hemisphere Was Built

Name: How the Largest Earthwork in the Western Hemisphere Was Built
Uploaded: 2018-05-15T20:35:42Z
Duration: 1 min 34 s
Description: 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?

From:America's Lost Pyramid

1m 34s
HD
TV-PG

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?