Schloss Rubein was probably built in the 13th century by the lords of Rubein. The first document of castle dates from 1220. The major restoration took place after 1875 by the Count Brandis and later by Countess Anna Asseburg-Wolff-Metternich and his husband. Their descendants are still in possession.
The 21m high tower was erected for the defensive purposes and the castle was built around it. during The late Gothic chapel dates from 1455. The imposing structure, surrounded by a 5-hectare park, now houses a hotel and is used for conferences.
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.