On the site of the current Visconti-Castelbarco Castle, a fortification had been existing at least since the 10th century. At the end of the 13th century the castle became a property of the Visconti of Milan. It was then inherited by a lineage originated by Uberto, brother of Matteo Lord of Milan, initially the Visconti di Somma and later the Visconti di Cislago.
Destroyed in the 17th century, it was raised again in the form of a baroque villa on the original U-shaped plan and with two towers at the corners of the main facade. A crenellated roof was added to the building, providing the current revival castle aspect.
The castle belonged to the Visconti di Cislago until the 18th century. The marriage of the last female member of the Visconti di Cislago to a Castelbarco led the castle in the hands of the bridegroom's family. Their descendants assumed the surname of Castelbarco-Visconti.
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.