In my opinion, the most amazing thing about this jail is the fact that it was in use only about twenty years ago!
The Adelaide Gaol is open to visitors; they have self-guided tours (on cassettes) which tell you all about the different parts of the jail, and on Sundays they have guided tours available. Entry fee was about $7 for adults.
The different parts of the jail - cells, garden, shop, infirmary, hanging tower (yes, a number of people were executed in this jail), guards' tower, visitor's area - have various signs posted telling you interesting stories or facts about those places.
They also have sleepovers and 'haunted tours' on offer.
It's quite an interesting place to spend an hour; you probably wouldn't need any more than that. Oh, and we got there a little before 3:30 (which is the official closing time) and were told that 3:30 is just the latest time when they admit visitors - so they keep it open until at least 4.
This old gaol is the part of the Australian history. It's not just interesting, because you can learn about Adelaide's penal history, but architecturally is also worth a visit and to spend a few hours there.
Check my photos about the Adelaide Gaol
The Adelaide Gaol is a great bit of history of Adelaide and a great place to visit. I would recommend going on a tour and hearing all the history about the place form the people that know it best. I visited the Adelaide Gaol with a group of kids and we actually stayed the night and did a night tour. It was really interesting to hear about all the little stories.