Security measures in a cell. Richmond Gaol, Richmond.
The Richmond Gaol is the oldest intact gaol in Australia. Building of the gaol commenced in 1825, and predates the establishment of the far more famous penal colony at Port Arthur by five years. It continued to house prisoners right up until 1928.
All of which logically leads me to today's Sunday Top Five: Mein Schönster Würste Aller Zeiten (Und Nicht Nur Die Deutschen)!