Ozalj Castle, located on the stone cliff perched above the Kupa River, is one of the best-known fortifications of this type in Croatia. It is a very old stronghold (first mentioned in 1244) that has been converted into a castle. The popularity of this castle is because this was the joint castle of the Croatian noble families of Frankopan and Zrinski. In fact, it was the scene of the unlucky Zrinski–Frankopan conspiracy, which significantly marked the history of Croatia. In the castle there is a museum and a library, and it is in a relatively good state of repair.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.