Monk's Mound (IMAGE) University of Wisconsin-Madison Caption At Cahokia, Monk's Mound, the largest earthwork built north of Mexico prior to the arrival of Europeans is pictured. This photograph was taken from the mound's west side. Credit Sissel Schroeder Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.