The Route of Monarch Butterflies Along Historic Route 66 To Be Discussed Sangamon County Historical Society Elaine Evans / 9/20/2022 5:30 PM - 6:30 PM 0 556 Article rating: No rating The migration pattern of Monarch butterflies along Route 66 through Sangamon County and a new site to promote the road’s rich history will be the topics of the Sangamon County Historical Society program at 5:30 p.m. Tuesday, September 20 at the new Route 66 Experience complex on the Illinois State Fairgrounds. The event is free and open to the public. Read more