Key used at Minnesota Territorial Prison (later Minnesota State Prison), Stillwater. It has the number "5" stamped into its head; it opened a prison guard's gate, possibly Gate 5.

Aerial view of Minnesota State Prison, Stillwater, 1954. Photograph by Mary Kruskopf.

Dining hall in Minnesota State Prison, Stillwater, 1951. Photograph by the Minneapolis Star-Journal Tribune.

Cell block in Minnesota State Prison, Stillwater, 1950. Photograph by the Minneapolis Star-Journal Tribune.

Prisoners working in a factory at Minnesota State Prison, Stillwater, 1950.

Prisoners working at sewing machines, Minnesota State Prison, Stillwater, 1950.

Cell in Minnesota State Prison, Stillwater, 1950. Photograph by the Minneapolis Star-Journal Tribune.

Former Minnesota State Prison, Stillwater. Photograph taken by John Runk, Jr., in 1936, twenty-two years after the prison was shut down and its inmates were moved to a new facility.

Former Minnesota State Prison, Stillwater. Photograph taken by John Runk, Jr., in 1936, twenty-two years after the prison was shut down and its inmates were moved to a new facility.

Former Minnesota State Prison, Stillwater. Photographed by John Runk, Jr., in 1918, after the prison had been shut down and its inmates moved to a new facility.