County for use as the county courthouse. Porticoes were added to the courthouse in the late 1850s, which made the building a structure in the Greek Revival style. The building served as a courthouse between 1839 and 1933, when it reverted to the state. In 1933, the old courthouse became the Vandalia State House State Memorial, and an extensive interior refitting and reconstruction program began. In 1985, the building became a State Historic Site within the new Illinois Historic Preservation Agency, which maintains the old state house and interprets it to its brief time as Illinois's fourth capitol building in 1836-39. Guided tours are offered, and visitors can also view the period rooms independently. References External links Vandalia State House Abraham Lincoln National Heritage Area County courthouses in Illinois Courthouses on the National Register of Historic Places in Illinois Federal architecture in Illinois Former courthouses in Illinois Illinois, Vandalia Government buildings completed in 1836 Government buildings on the National Register of Historic Places in Illinois History museums in Illinois Illinois State Historic Sites Museums in Fayette County, Illinois National Register of Historic Places in Fayette County, Illinois