Karostas Cietums - Liepāja, Latvia
Have you ever eaten at one of those restaurants where the staff is mean to you on purpose? Well, the Karostas Cietums is like that, but much, much worse. It's an old Soviet prison that today is, well, an old Soviet prison.
Modern inmates -- guests -- are all paying to be locked up. You get served unappetizing prison food, have to bunk on a hard, flimsy mattress and the "guards" will even yell at you and treat you like a prisoner. And, no, this isn't an adults-only fetish hotel. It offers special rates for groups of schoolchildren and features an on-site museum.