Norderburg is a moated castle that was established in the 14th century. It was destroyed in 1514 during the Saxonian rebellion and rebuilt in 1534 by Hicko Kankena.
The castle's architecture is quite impressive with a beautiful facade, flanked by two lion statues at the entrance, an ornately designed Knight's Hall, and a spectacular great hall that features baroque paintings. The castle changed many owners and was also used as a private school, and later as a college. Since 1951, it is home to a middle school.
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.