The John Marshall House Museum is a historic house museum located in Old Shawneetown, Illinois. The museum is a historically inaccurate (the original had a straight staircase, the reproduction a spiral one, for example) reproduction of the John Marshall House, which was located at the site until 1974; the original house was demolished so that the reproduction could be constructed. The original house was built in the early 19th century for banker John Marshall, who ran the first bank in the Illinois Territory. At the time of its demolition, the house was one of the oldest surviving brick buildings in Illinois.