Žovnek Castle lies above Lake Žovnek. The Lords of Žovnek, later Counts of Celje, were named after the castle. The castle was first mentioned in 1278 as Castrum Sevnekke, and later as Sannegg. Its history goes back to at least the 12th century. The Žovnek noble family used to live there at the end of 12th century, but their descendants moved to Celje (Cilli) in 1333 and went to aquire title and estates, becoming the Counts of Cilli.
Since 1995, the castle has been restored by a group of volunteers within the framework of the Cultural and Historical Society in cooperation with the Municipality of Braslovče, and many of its covered rooms have been used in all their glory. From the castle, which is reached by a footpath and offers a pleasant walk, there are views of Lake Žovne, the northern peaks of the Posavje hills, the wooded slopes of the Dobrovelj plateau and even Celje.
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.