From the Maitland Mercury report:
Welcome to Maitland Gaol which for 150 years - 1848 to 1998 - was one of the state’s toughest maximum security jails. Seriously hard time.
Step inside the two-and- a-half foot thick brown sandstone walls, still lined with razor wire and topped with looped barbed wire. Overlooking that were the watchtowers in each corner and walkways where warders would patrol - for 24 hours a day in those early days, rifles in hand. Eventually video surveillance cameras would be used to help ease their workload.
Full article available at Maitland Mercury, 28 May 2017.