Henry B. Clarke House
Clarke House may have been modeled on the home of William B. Ogden. The Clarke house is often described as the oldest surviving house in Chicago, although part of the Noble-Seymour-Crippen House in the Norwood Park neighborhood was built in 1833. (However, Norwood Park was not annexed to Chicago until 1893.) The Clarke House was designated a Chicago Landmark on October 14, 1970. It was added to the National Register of Historic Places on May 6, 1971.
Old Cahokia Courthouse
The reconstructed Cahokia Courthouse is a historic site of the state of Illinois and is one of the oldest in the United States. Since 1985, it has been under the jurisdiction of the Illinois Historic Preservation Agency (IHPA). Exhibits focus on the issues dealt with by the court around 1800, and the history of the structure's physical movements. A visitor center also features exhibits about the area's occupation by the French in the 18th century, as well as the nearby Nicholas Jarrot Mansion.