Château de Mauléon was first built in the 11th century. The wooden building was replaced in the 13th century by the strongest castle of area in a strategic location on the road to Spain. Later it was conquered by English army. In 1642 the castle is demolished by order of Louis XIII. In 1648 a partial reconstruction was organized but the castle was finally left abandoned. During the French Revolution it was a prison.
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.