The exact history of the Wolfenstein Castle is unclear. The archaeological excavations have dated the construction to the mid-12th century. The first written document dates from 1283 when Gottfried von Sulzbürg changed his name Wolfenstein and started the nobility. Hans von Wolfenstein died childless in 1462 and the castle was moved to the possession of Bohemian (Czech) king. Wolfstein lost its importance in the 16th century after been damaged in War of the Succession of Landshut in 1504. The castle was abandoned and fell into disrepair.
Today, the ruins of Wolfenstein are in good condition. It went through extensive excavations and renovations in the 1990s.
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.