Originally built in the 11th century, when the Normans fought the Byzantine rulers in Southern Italy, the Corigliano Calabro Castle expanded in the first half of the 1300s thanks to the powerful Sanseverino family. In the 15th century, the castle was renovated and its architecture took on the typical features of the Aragonese style; the structure was further altered in the 17th century by the Saluzzo family, and in the 19th century by the Compagna family.
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.