Joliet's economy is based on casino gambling on the river, tourism in nearby state recreation areas (including Channahon State Park, the Illinois and Michigan Canal National Heritage Corridor 【the first such corridor designated by the U.S. Congress】, and the Des Plaines Fish and Wildlife Area), and manufacturing (including petroleum products, steel products, wire, paper products, heavy machinery, and chemicals). Joliet is also a shipping and transportation centre. Notable attractions include the 40-room Jacob Henry Mansion (1876), with a foundation made of limestone; the Rialto Square Theatre (1926), on the National Register of Historic Places; and the post office (1903), made of light-coloured limestone. Joliet features a historical museum (opened 2002) and is the site of Chicagoland Speedway and Route 66 Raceway. The city is the seat of Joliet Junior College (1901) and the University of St. Francis (1920). Lewis University (1932) and Isle a la Cache (“Island of the Hiding Place”) Museum, with exhibits on the French fur trade and the area's Native American heritage, are in nearby Romeoville. The city was formerly the site of a large state prison, the Joliet Correctional Center (1858–2002). Stateville Correctional Center, a maximum security prison, is just north of the city. Inc. 1852. Pop. (2000) 106,221; (2006 est.) 142,702.