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Frohburg Castle area was already inhabitated in Bronze and Roman Ages. In the 10th century the local Frohburg noble family ruled the area and built the castle. It was enlarged during the Middle Ages and also an iron furnace was established.
Frohburg family line died out around in 1367 and the castle was left to decay. Later the stones were reused by local farmers. Today the ruins are one of the most popular sights in Olten area.
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.