Boller castle was first mentioned in 1350, when it was owned by Otte Limbek (Queen Margareth's trusted man). The current main building was built in 1550-1588 and reconstructed in 1759. Today it is owned by Horsens Municipality and used as a nursing home. The beautiful park and meander along the forest road through the valley to Boller water mill is 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.