St. Nicolai Church dates to the 13th century. Originally built in late Romanesque style and dedicated to the patron saint of merchants and seafarers, the church is the oldest building in the community. Renovations in the 15th century developed the church into a Gothic hall with two transepts and a tower 27.2 m high.
On display in a glass-covered sarcophagus in the northern transept are the remains of the Haraldskær Woman, one of the best conserved of the iron age bog bodies. The southern transept houses the sarcophagi of Kai de la Mare and his wife. The exterior brick wall of the north transept has an interesting feature of 23 spherical indentations approximately 15 cm in diameter, which hold the skulls of 23 robbers who were caught and beheaded in the nearby Nørreskov forest. In front of the church stands a sculpture of the priest Anders Sørensen Vedel.
The church was seriously damaged during the Thirty Years' War by the Catholic troops of Wallenstein. Since that time it has undergone several major restorations: in 1744, 1855-56, 1887-88 and 1964-66.
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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.