Settimo Vittone Castle was built to inthe 9th century to the site of 6th century abbey. The castle was important step for pilgrimages to Rome. The castle was demolished in the 16th century.
In the courtyard is a Pieve di San Lorenzo, one of oldest existing Christian chapels in the area. It was probably built in the late 9th century.
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.