Østermarie Church was originally built in the early 13th century. While it was being demolished in 1890, it was discovered it was of considerable architectural interest and work was stopped. The new church from 1891 is also in the Romanesque style.
The new church was built on the place where the old church tower once stood. The architect was Andreas Clemmensen who was involved in the design of Christiansborg Palace. Built in the Romanesque style, it consists of a tower, nave, chancel and apse together with two cross pieces. The outer wall is granite from the nearby Paradis quarry.
The rear wall of the altar is topped by seven candles in a seven-armed candlestick. The limestone font (ca. 1250), in late Romanesque style, comes from Gotland. The pulpit has four carved panels in oak from 1593. In the northern cross arm, there is an epitaph to Jens Kofoed, popularly credited with the liberation of Bornholm from the Swedes in 1658. The cross below the chancel arch, added during the church's restoration by the architect Rolf Graae in 1964, is the work of Paul Høm, a local artist.
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.