Take a look at the sets and cast from the next season of AMC's Walking Dead. Nobody outright says that they're in a prison, but it sure looks like one. Jeebus is it dark (and awesome). Also someone said the Governor is coming, so you heard it — that's a promise! No more goddamn farm. Check it out.
WARNING: Top Image is VERY SPOILERY. If you haven't read the comics and don't want to be spoiled, don't hit "expand."