Marchione castle was a hunting lodge of the Acquaviva of Aragona, counts of Conversano, from around the year 1000 AD. The sumptuous building, with a rectangular shape and four cylindrical keeps on the corner, has been built on three floors. The ground floor, the mezzanine and the four towers date back to the Middle Ages, while the upper floor dates back to the Neoclassic- Baroque age, maybe a work by the school of Vanvitelli.
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.