To complete a marathon's distance of 26.2 miles, the runners had to make it around the track 95.377 times
I've run workouts in the Pettit National Ice Center before- they have a 2 lane 450 meter track around the perimeter of the ice rink. It's a good alternative to running outside in Milwaukee or the treadmill.
In the 70s there used to be a small marathon in Naperville, Illinois, and one year I went down it snowed so much they moved us inside for a 10 mile race. Not sure I'd want to run in circles a full 26.2 though.