Klenovnik is one of the largest castles in Croatia. First document of the castle dates back in the 13th century when the Hungarian-Croatian king Béla IV takes it away from Pochun and gives it to then ruler of town Varaždin. In the late 17th century, king Maksimilijan sells this castle for 20 000 forint to noble Croatian families Gašpar I Drašković.
In the 19th century, Count Drašković sold Klenovnik in order to gain money for the restoration of his other family castle, Trakošćan. Klenovnik was bought by then Austrian minister of finance, baron Bruck. His family later sold the castle which, since then, changes its owners regularly. Today, the castle is owned by city of Zagreb and it has become a hospital for patients with tuberculosis. Before its renovation in 1925, Klenovnik supposedly had 90 rooms and over 365 windows. The castle has a huge and beautiful park, stunning wall paintings from the 19th century, three baroque altars, pulpit and a Drašković family vault.
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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.