Schaumburg Castle was established somewhere in the 12th century. Initially a major military fortress, it was later transformed into a residential structure. Today, the castle, which is made primarily of basaltic rock, shaped like an octagon with towers in the corners. Only the outer bailey and the southern door still remain from the earlier fortress, other buildings date from the restoration made in 1850-1855.
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.