The 'Oxford Unlocked' experience is based in the old prison. Visitors get taken up the old castle tower by a costumed guide, who leads you up through rooms with exhibits to the top where there is a 360o view of the city. The exhibition then shows you the history of the prison, with interactive displays and panels about the crimes and punishments of those who ended up here. A nice touch is a chance to have your photo taken as a 'mugshot', and compare yourself to those of real, historic inmates. The displays are thought-provoking and well-presented. In addition, you can walk up on the castle mound. I was fascinated to see this area which has been off-limits to city residents before, and it's well worth a visit. You can use Tesco 'Day Out' vouchers, which, if you're a Tesco clubcard holder, makes it free. read more