CTTF, who took this picture, writes: "Unfortunately I came on a day when there were no tours on site and had to only see the visitors' center as well as the old farmhouse nearby. This is another part of Chicago's "Emerald Necklace" - A chain of forest preserves spanning the waterways of Cook County. The photo I took is from the nature center. It's very hard to get a good photo due to the column in the way."