Alton Prison, Alton

The Alton Military Prison was a prison located in Alton, Illinois and originally built in 1833 as the first state penitentiary in Illinois and later closed in 1857. During the American Civil War, the prison was reopened in 1862 to accommodate the growing population of Confederate prisoners of war and ceased to be prison at the end of the war in 1865. The prison building was demolished not long after the Civil War. All that remains of the former prison site is a section of ruin wall that is maintained by the State of Illinois as an historic site. The prison site is included in the U.S. National Register of Historic Places. ()