Chanute Air Force Base was located near Rantoul, Illinois. It closed in 1993 but there is the Octave Chanute Aerospace Museum. Chanute had a Minuteman training silo which appears to be open to the public, see http://www.aeromuseum.org/silos.html (link is dead, try http://web.archive.org/web/20030630093722/http://www.aeromuseum.org/silos.html). See also http://www.aeromuseum.org/exhibitsCurrent_minuteman.html which sadly points out the silo has been permanently closed.