Finding North America’s lost medieval city | Ars Technica
►http://arstechnica.com/features/2016/12/theres-a-1000-year-old-lost-city-beneath-the-st-louis-suburbs
A thousand years ago, huge pyramids and earthen mounds stood where East St. Louis sprawls today in Southern Illinois. This majestic urban architecture towered over the swampy Mississippi River floodplains, blotting out the region’s tiny villages. Beginning in the late 900s, word about the city spread throughout the southeast. Thousands of people visited for feasts and rituals, lured by the promise of a new kind of civilization. Many decided to stay.