The first document to mention the castle in Carovignot dates back to 1163. Since then, the fortress fell in the hands of several rulers, the Normans of Geoffrey III of Montescaglioso, the Swabians in 1194 and the Angevines in 1306. In 1382 it passed to the prince of Taranto Raimondo del Balzo Orsini who then bequeathed it to his wife, queen Maria of Enghien, countess of Lecce.
The present appearance of the castle is due to recontruction works carried out between 1300's and the 1400's on a previous building. The rare triangular plan features angular towers connected to each other by curtain walls. The whole upper level is slightly jutting, while the walls are thickly crenellated. The curvilinear tower further amplifies the impression of a military building and unveils the Senese influence of the architect Francesco di Giorgio Martini.
References: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.