Prem Castle was built before 1213. After the Udo Knights there were many owners, among them the Walseeis, Hallers, Habsburgs, and Porcia Dukes. This compact two-storey building with a ground plan in the shape of the letter L has a Romanesque nucleus with an extension and a smaller yard protected with a wall. The inner yard was decorated with Renaissance arcades. In the middle of the yard stands a small well. The entire structure is additionally protected with exterior Renaissance walls and cylindrical towers. A large cistern stands in the larger courtyard, between the castle and the exterior walls.
The area on the ground floor of the castle is cross rib-vaulted. Above it is the castle chapel, which was set up at the end of the 14th century. Modest console masques in it are reminiscent of Parler workshops. A large hall on the upper floor decorated with a wooden promenade gallery was rearranged before the last war by its owners, the Zuccolini family from Trieste. It was painted with unusual decorative frescoes on a dark background.
The castle houses local museum collections. The cylindrical towers of the outer walls have been arranged.
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.