(IL-56-05) N. of Marengo, Marengo Township, McHenry County, IL. IL23 N. 4.5 miles from jct with US20 in Marengo, E. on Kishwaukee Valley Rd. 0.9 miles to the bldg on the N. side of the road. (N42 18.819 W88 35.490) Photos by Michael Bihlmaier.