America Unearthed (2012)

S2E9 Mystery of the Serpents

In Ohio, a colossal serpent-shaped mound winds its way through the landscape, its origins and purpose shrouded in mystery. Meanwhile, thousands of miles away, another serpent mound with unknown roots stretches across Loch Nell. Could there be a link between these two locations? As Scott Wolter delves into the investigation, he uncovers that both sites were created using similar principles of archaeoastronomy. Additionally, he finds numerous other animal-shaped effigies scattered throughout the Midwest. His quest for answers suggests a connection between these sites and one of America's greatest pre-Columbian enigmas—the vanishing of the Cahokia civilization, the largest city in pre-Columbian America.