The first written mention of the castle of Potštejn is from the late 13th century. The castle was conquered only once in history, in 1339 by Charles IV before he became king. The village below the castle was first mentioned in 1350. The golden times of the castle were after 1495, when it was bought by Vilém II of Pernštejn, who had rebuilt it.
In the 17th century, economic decline came, the castle fell into disrepair, and the entire Potštejn went bankrupt. In 1746, the estate was bought by the nobleman Jan Ludvík Harbuval Chamaré, who had built here a château. After the House of Chamaré died out in the mid-19th century, Potštejn was acquired by marriage by the Dobřenský of Dobřenice family. They owned it until 1945, when their properties were confiscated.
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.