The oldest parts of Follingbo Church are the nave and tower. They date from circa 1200 and together form an unusually accomplished example of Romanesque architecture on Gotland. Although lacking in ornamental sculpture, the tower and nave are well-proportioned and unusually professionally executed. The choir is later (late 13th century) and already Gothic in style, and also considered unusual for its kind. The choir replaced an earlier, Romanesque choir with an apse. The current choir instead has a straight eastern wall, adorned with a single tracery window, in which fragments of medieval stained glass panes remain. The sacristy was built in 1820-21.
Inside, the church has a painted ceiling, decorated at the end of the 17th century. Most of the furnishings are also from the 17th or 18th century. An exception is the undecorated baptismal font, which is medieval.
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.