The water fortress of Koluvere was established in the 13th century by the bishop’s vassal Lode. The tower fortress, convention hall and cannon tower were built later. This place has been a battlefield both during St. George’s Night uprising as well as during the Livonian war. In 1439 it became one of residences of Saare-Lääne bishop. In the 17th century the fortress was turned into a manor ensemble. In 1771 the empress of Russia – Catherine II – bought it and gave it to her lover – Prince Grigori Orlov. From that time and until 1917 the castle was used by the Russian czar’s family. Later on the building has been used as a boys’ educational establishment and as a nursing home.
At present the castle is in private ownership and being renovated. It is open in advance bookings only.
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.