Hogrän Church consists of a Romanesque tower and a Gothic nave and choir. The tower thus is the oldest part of the church, dating from circa 1200. Attached to it was originally an earlier stone church, also Romanesque in style and erected during the 12th century. During the 14th century, it was however replaced by the presently visible Gothic nave and choir. A few details from this earlier church, such as a few sculpted reliefs and a Romanesque window-frame, have been incorporated in the Gothic church.
The interior of the church is characterised by the broad width of the nave (10 metres). The church contains a number of medieval items. The triumphal cross is one of the oldest wooden sculptures from Gotland, dating from the 12th century. The finely carved doors of the tabernacle are from the early 15th century, and the door of the sacristy is likewise medieval. The baptismal font, probably a work by the craftsman or workshop known as Master Byzantios, is from the late 12th century. Of later date are the altarpiece (1634), the pulpit (1637) and the choir stalls (17th century but with incorporated medieval elements).
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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.