The Baroque castle of Schillingsfürst was first mentioned in the year 1000. It was owned by Hohenlohe family since 1300s. However, the castle was destroyed by Ludwig of Bayern in 1316. The next castle was destroyed in 1525 and third one again in 1632 in Thirty Years' War. The current castle was built by Prince Karl Albrecht Schillingsfürst in 1753-1793. Today there is a museum.
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.