Rosenburg Castle was built in the 12th century by the Counts of Riedenburg. It has been rebuilt and extended many times, right up to the present day.
In the Peasants' War , the castle was conquered in April 1525 by rebels and largely destroyed. A reconstruction took place between 1556 and 1560. In the Thirty Years' War the castle 1632-1634 was sacked several times. During the War of Spanish Succession Rosenburg was conquered by the Austrians.
The well maintained property now serves as a castle 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.