Yo ho!
I’m collecting ideas for the Level Design of a prison.
What you think it’s important to have in a prison? (Areas/props/assets)
Here is some examples we’ve done so far.
Thanks 
Real world prisons do not have many rooms.
You have the Inner Yard where prisoners mingle that include areas for reading (including library stands and what not), television, and sometimes working out.
You have the Outer Yard where prisoners play sports often with balls, bats, and hoops.
You the kitchen & dinning hall.
You have the communal showers.
You have isolation cells for punishment.
Beyond that it is just laying multitiered cells together in a way that makes sense where in the real world you would only have like 4 guards to a 100 prisoners.