Castle of Norman origin (Castello Normanno) is located in the centre of Adrano, built in 1070 on behalf of Norman king Roger I. They probably built the keep on the ruins of a pre-existing Muslim fortress at this site. Its purpose was to ensure control over a large portion of the surrounding Etna area.
Inside the castle is the archaeological museum with antique findings of the region.
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.