Great Fire

From io9 (via Zite) is this story about the excavation of Cahokia, a Pre-Columbian city located where St. Louis is now. "Ringed by massive earthen mounds, farmlands, and wealthy suburbs," Cahokia was North America's largest city and comparable in size to the largest European cities of the time.

Cahokia was mysteriously abandoned and scientists have now discovered evidence that a great fire may have been the cause. But the exact nature of that fire is still a mystery.

Fascinating stuff.