Imastu (Mönnikorb) was first mentioned in written records in 1447. The present-day building was built in the 1882 by master builder Friedrich Modi from Rakvere. It is an eclectic, irregular building with neo-Romanesque details. Ornamental painted ceilings and tiled stoves have been preserved. In the 20th century, the building housed a nursing home for a long time, which has now moved to a new building. The manor is now in private possession.
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.