We visited the Red History Museum in Dubrovnik and it was well worth a visit.
The history of Yugoslavia, Tito, Communism, the two world wars etc. is a tremendously interesting one with after-effects still being felt today.
This museum gives us a glimpse into life in Yugoslavia under communist rule and has a great deal of objects and things from that time, including the iconic Yugo motor car.
If you are in Dubrovnik the museum is worth a visit.