While Europe was embroiled in the the Dark Ages, bustling Cahokia featured architectural marvels, and residents sipped a black coffee-like beverage and played a game similar to bocce ball. Via Live Science:
Cahokia was a city that, at its peak from 1050-1200 A.D., was larger than many European cities, including London. Located across the Mississippi River from modern-day St. Louis, it was the largest pre-Columbian city north of Mexico. The inhabitants of Cahokia did not use a writing system, and researchers today rely heavily on archaeology to interpret it.
Cultural finds from the city include evidence of a popular game called “Chunkey” and a caffeine loaded drink. Artistic finds include stone tablets carved with images (such as a birdman) as well as evidence of sophisticated copper working, including jewelry and headdresses.
The city fell into decline after 1200 A.D., becoming abandoned by 1400. The name “Cahokia” is from an aboriginal people that lived in the area during the 17th century. Much of the city lies buried under 19th- and 20th-century developments, including a highway and the growth of the city of St. Louis.