St. John's Church in Petersdorf dates from the 13th century. Its 64-metre-high steeple was used as a daymark by ships on the Fehmarn Belt and Sound, as it is visible for up to 20 miles at sea. The church and adjacent cemetery are surrounded by 64 lime trees. The altar triptych dating from the 14th century is considered a masterpiece of Gothic carving skill. The oldest artefact is the font of Gotland limestone. The church also contains a particularly valuable 15th century altar shrine.
References: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.