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:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.