Opprebais Castle was built in the first half of the 13th century or maybe at the end of the 12th century probably by a local noble family. It is a square castle with round corner towers. In 1486, the seigniory was sold to Jean de Glimes. It remained in the hands of his descendants until 1660 when the castle was sold to the Dukes of Arenberg. In the 17th century a farm was built inside its walls.
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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.