Spine Castle was built in the late 12th century and destroyed in 1348. In the 16th century the castle ruins was converted into a hunting lodge. In 1933 a serious fire almost led to complete destruction, only the southern buildings were saved while the other wings collapsed and were never rebuilt.
Today only part of the castle is habitable while the rest lie to ruins, although impressive. Spine castle is not 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.