Vårdsberg church was built originally a round church. It is located on the river banks and in ancient times it was able to sail there from the Baltic sea. The church might have been built also for the stronghold against the pagan Baltic people, who made raids to Sweden. In the 13th century church was enlarged with a chancel and two transepts. The western tower dates from 1774. Mural paintings date from the 1400s and pulpit was made in 1757.
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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.