Hagenskov Castle lies in the countryside a few kilometres to the east of Assens. It is a grade A listed building protected by law from substantial alteration. It was built in 1775 in a classical style by the design of architect G. E. Rosenborg. There had been a castle on this site for many centuries and remains of the medieval castle’s dungeons. In the 13th century a dispute with the King led to an archbishop being imprisoned here. The castle is visible from a public road, which leads right through the castle, but otherwise there is no public access to the castle.
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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.