All visitors to Dubrovnik are able to purchase the Dubrovnik Card.
The card is on sale at all cultural institutions in the city of Dubrovnik and all of the information office of the tourist boards. This new offer for tourists to the city allows guests to enter all museums in the city including the city walls as well as being able to use the city’s public transport.
Facilities included in this offer are the Maritime Museum, Natural History Museum in Dubrovnik, House of Marin Držić and the Dubrovnik City Walls, Art Gallery Dubrovnik, Cultural and Historical Museum, Rupe Ethnographic Museum and Gallery Dulčić-Masle-Pulitika. ”
More info on http://www.dubrovnikcard.com