In Trondheim, Norway, we have a pretty cool - and entrance-free - museum called the Norwegian National Museum of Justice (locally known as Justismuseet). They even have a very informative website with some online exhibitions as well: Justice Museum website. The best is to visit the place yourself, naturally.
I have myself been there twice in my lifetime, last time was exactly one year ago. I did spend some time there and studied the exhibitions carefully: quite interesting to say at least. Here are some sampler-images for you to enjoy.
Curtains of the heavy kind.

Not only a straight-jacket, but also a cage should you be extra wild.

A bed from “Reitgjerdet” - a former treatment center for the insane in Trondheim.
Verious tools and medications used at “Reitgjerdet”.
A police desk from Trondheim Police Station (“lennsmannskontor”).

Yes, that is indeed a nail through the skull. Punishment was lethal.

A German World War 2 Enigma code-machine.

German soldeirs uniform from World War 2.

Counterfeit money produced in Trondheim, 1 billion NOK.
Foreign and Norwegian counterfeit money.
More locally produced counterfeit money.
More locally produced counterfeit money.
More locally produced counterfeit money.

- and even more locally produced counterfeit money.
Aerial photo of LADE, Trondheim, showing the location of the airport which was made there by Germans invation-force during WW2.