The Indian Boundary Prairies, located only 25 miles southwest of Chicago, consists of over 200 acres of pristine Illinois Native Prairie, much like the area was pre-settlement. Wildflowers, birds, butterflies abound at the prairies. There are four prairies total: Gensburg-Markham (157th & Whipple), Sundrop (151st & Central Park Avenue), Paintbrush (155th & Millard) and Dropseed (156th & Homan Avenue). The Gensburg-Markham Prairie is a National Natural Landmark dedicated in 1988 by the U.S. Forest Service. Also visit the Prairie Information & Learning Center, 156th & Hohman Avenue, Markham, IL.