Homburg Castle was built in the early 1170s by the Lords of Hohenberg, who were Würzburg ministeriales. Through inheritance it passed to the Bickenbach family in 1381. In 1469, the community along with the Homburg and the surrounding places was sold to the Prince-Bishopric of Würzburg.
The current appearance dates from the 13th and 15th centuries. Homburg was badly damaged by fire in 1680 and started to decay. Today ruins are open to the public.
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.