An aerial view shows Avery Lake and Kincaid Mounds, a settlement occupied during the Mississippian period (1150 to 1450 CE). The Southern Illinois settlement is near the Ohio River.

With the official start of winter just days away, many people will be heading to the Cahokia Mounds State Historic Site in Collinsville, Illinois, to observe the winter solstice. 5 On Your Side ...