The Château du Garranée was originally constructed in the 11th century. It was modified in the 13th, 14th and 15th centuries. A tower is all that remains of another castle, believed to be 13th century, belonging to the abbots of Faget. The ground floor had no openings other than a small bay in the southern wall. It represented the typical medieval military architecture of the region. It was already in ruins at the French Revolution.
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.