The Tolštejn Castle (now reduced to ruins) was built in 1278 as part of the Zittau region's defense structure. George of Poděbrady ordered the castle to be seized shortly after the Hussite Wars and after many conflicts, the Tolštejn dominion was taken by 1471 by two Saxon princes, Ernest and Albrecht. During the Thirty Years War, the army of the Austrian Emperor occupied the castle. In 1607, the Swedish General Wrangel laid siege and burned down the castle.
References: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.