Wielkopolanin
Google
Nice museum with 3 levels, ground floor with photography from 20th century, showing Dubrovnik city and life of it's citizens, rural areas, all black-white.
Second and third floor have original items or reconstructions, mostly from XIX-XXth centuries, normal life items, like wooden barrels, table with belongings, items from some local workshops andall sort of daily life items. It's nice if you don't have interest in very old history like antic period, Roman empire or middle aged,because here you will find old but more relatable to our times museum.
Entrance is free if you have Dubrovnik Pass, which I recommend to buy by internet before your arrival to Dubrovnik.