Schloss Baldern was first mentioned in historical documents in the 11th century. In the mid-12th century, it was owned by a noble family known as the Edelfreien von Baldern. In 1280, the castle came into the possession of Count Ludwig V. von Oettingen. In the 15th century, it was pledged by his descendants and later redeemed in 1507. The current baroque appearance as the residence of the Counts of Oettingen-Baldern was established between 1718 and 1737. The construction was overseen by Franz de Gabrieli, and after his death, by his brother Gabriel de Gabrieli.
After the extinction of the noble family Oettingen-Baldern in 1798, the estate passed to the House of Oettingen-Wallerstein. Major renovations took place in the 19th century, including the landscaping of the hilltop into a landscaped garden. The tower was erected in 1887 under the direction of August von Beyer. As early as 1896, Schloss Baldern was opened to the public.
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.