Brahehus Castle was built by Per Brahe between 1637 and 1650s. Soon after Per Brahe died in 1680 Brahehus was abandoned and moved as a Crown property in the Great Reduction under Charles XI of Sweden. In 1708 the castle was destroyed by fire and not rebuilt anymore. From the ruins you have a fantastic view of lakes Vättern and Visingsö.
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.