Unterhof Castle was first mentioned in a document in 1185. It served as the seat of the stewards of Diessenhofen. In Rudolf of Habsburg in 1264, who incorporated the stewards of Diessenhofen into his service. Until 1399, the castle was expanded with the two-part east wing (northeast and southeast tracts) and the keep, as well as reinforced with a new defensive wall.
Unterhof has been renovated extensively since 1990. The old part of the castle continues to function as a restaurant.
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.