Cahokia Mounds

http://s.ngm.com/2011/01/cahokia/img/01-cahokia-central-plaza-615.jpg
Photo by Don Burmeister and Ira Block of National Geographic

Cahokia Mounds is/was a Missippian Indian City State that rivaled cities in Europe at that time. It was among a collection of American Indian communities located in the Midwest before the year 1000 and European contact.

https://neonobservatory.files.wordpress.com/2014/09/cahokia.jpg

http://3.bp.blogspot.com/-iqcEVCYGmI0/UQQWNCwHPmI/AAAAAAAAEzQ/4s950zG4jmg/s1600/Cahokia+Mounds+Iseminger+Painting.jpg