The Museum is about 150 yards from Dartmoor Prison, and housed in a building that used to be the prison dairy. It is the only museum run by HM Prison Service to be open to the public. The Museum narrates the history of the prison, and also includes the “Black Museum” of weapons and other items confiscated from prisoners, a collection of manacles and weapons, details of famous prisoners, insignia and uniforms, and the Prison today.
I recall that this was quite an interesting visit.
There is a small admission charge. Free car parking. Note that the Museum closes for lunch.