Thorn Abbey Church is a Gothic church built mainly in the 14th century. The Benedictian abbey was originally founded in 975 by bishop Ansfried. The oldest parts in the western part date from c. 1150. The abbey was closed in 1797 and after that its church has server as a parish church. It was restored in 1860-1881 by Pierre Cuypers.
There is a famous mummy located in the glass sarcophagus in the church crypt. The rich interior contains Renaissance and Baroque style altars from 1624 and 1769, a font from the 15th century and organs from the 18th century.
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.