Castle Dybów or Dybowski Castle was built by Wladyslaw Jagiello in the years 1424-1428. With time, the castle was a settlement that was called Nieszawa. In 1431 Toruń destroyed the castle, but soon restored and the Teutonic Knights Castle in it judged his crew. After the Peace of Brest Kujawski castle with the left bank of the Vistula, he returned to Polish.
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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.