Olstrup Church is a Romanesque church built around 1200. In the Middle Ages, the church was originally dedicated to St Lawrence. Built of red brick, the relatively small church first consisted of a Romanesque chancel and nave. It was later extended to the west in the Late Gothic period with a stepped gable. The chancel's cross-vaults and the round chancel arch may date from the church's original construction. The cross-vaults in the nave also seem to be older than the Gothic extension.
In 1936, Egmont Lind discovered frescos in the east vault of the nave which were dated to c. 1575. They present scenes of the Last Judgment. Christ is depicted sitting on a rainbow with his feet on the globe of the Earth, flanked by trumpet-playing angels and the 12 apostles. Some pre-Reformation features such as the lily and sword are included but there are no halos.
The carved pulpit from 1622 has figures of the apostles. The canopy is from c. 1675. On the north wall there is a figure of St Lawrence from c. 1300. There is a decorated font in Gotland limestone.
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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.