Check out this website about a very cool place to visit.
From the site: "McDonald's Corporation held onto the patch of property west of Chicago where franchise Store #1 once stood; Ray Kroc first opened for business there on April 15, 1955. It was demolished and replaced in 1984 by a modern McD's, still in operation. The company's PR big wigs finally realized they had a history to preserve, so they constructed a complete replica of Store #1 right across the street in Des Plaines." Check it out.