The ancient city of Cahokia in Illinois was the center of an advanced civilization from about 700 to 1400 A.D. Covering six square miles and home to up to 20,000 people, it was the largest prehistoric city north of Mexico. It ruled over a large area and had trade networks stretching across North America....

Cahokia's importance is recognized by it being designated a state historic site and a UNESCO World Heritage Site. It makes a good day trip from St. Louis and has an excellent interpretive center. You can also climb up some of the mounds to get a sweeping view of the site.

Now archaeologists have discovered one of its suburbs in a derelict neighborhood of East St. Louis. It's not much to look at today. The excavation is taking place between a derelict meatpacking plant and an abandoned strip club. Back in the day, though, it was a prosperous suburb of an important city with more than a thousand dwellings and earthen pyramids just like those of Cahokia....