Sunnersberg medieval church dates back to the 1200s, but it has been enlarged and reconstructed several times. Fire damaged it badly in 1583. The most remarkable detail is an altarpiece, which is painted by famouse Flemish Baroque artist Anthony van Dyck in 1620. It was donated to Sunnesberg church by Clas Julius Ekeblad in 1779. The pulpit was donated by Magnus Gabriel De la Gardie in 1670.
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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.