There has been a fort in the site of current Altenklingen castle since around 1200. It was owned by the Barons of Klingen until 1395. After the last owner of Klingen family was killed in battle the castle changed hands several times.
Leonard Zollikofer (1529-1587) demolished the old castle and commissioned architect Mathäus Höbel from Kempten im Allgäu to build a new one. Today it is still privately owned by the family.
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.