The Slavic toponym Dubrovnik originates from the Proto-Slavic term for an oak forest "dubrava" or "dobrova", which was abundantly present in the hills north of the walled city of Dubrovnik by the end of the 11th century. The historical town center of Dubrovnik is one of the most significant urban wholes in all of Europe. It reached its present form mostly during the 13th century. The most noted features are the following: the cathedral, the church of St. Blaise, the Franciscan and Dominican monastery, the Knez Palace, the Sponza Palace, etc.
The historical town center of Split - the palace of Diocletian was built around AD 300. The following sites have been preserved from the time it was built: the church of St. Dujo (built as a royal mausoleum), the baptistry of St. John (built as a Roman temple), the Peristyle. 
Romanic, gothic, renaissance and baroque sacral and popular buildings from previous epochs have also been preserved. The ground plan of the palace is an irregular rectangle with towers projecting from the western, northern, and eastern facades. It combines qualities of a luxurious villa with those of a military camp, with its huge gates and watchtowers.
A monumental court - the Peristyle, formed the northern access to the imperial apartments. It also gave access to Diocletian's mausoleum on the east (now St. Domnius' cathedral), and to three temples on the west (two of which are now lost, the third having become a baptistery).
The National Park of Plitvice Lakes - is a veritable jewel of nature, the most beautiful in Croatia. Due to its uniqueness and beauty, UNESCO has included the Plitvice lakes in the world natural heritage list in 1979. It is most famous for the Plitvice Lakes National Park, a major tourist destination and its main source of income, together with arable lands, grazing lands and woods.
United Nations Educational, Scientific and Cultural Organization (UNESCO) is a specialized agency of the United Nations established on November 16, 1945. Its stated purpose is to contribute to peace and security by promoting international collaboration through education, science, and culture in order to further universal respect for justice.