Mladá Boleslav Castle, originally built in the first half of the 14th century, has gone through many development stages. Despite the Renaissance castle and the period of devastation after the Thirty Years' War, the army took over the building for 200 years and converted it into a barracks. Between 1940 and 1943, Jews from the wider Boleslav area were interned here. Today it is the seat of the Museum of Mladá Boleslav and Archive.
The castle was used as a seat of castle wardens and later clerks serving the nobility and the nobility itself.
After the Thirty Years’ War, the castle became the property of the town and decayed significantly. In the mid-18th century, the entire building was reconstructed to serve as army barracks and was used by the army until 1953. After this, the castle served as a textile warehouse until 1972.
The Museum of the Mladá Boleslav region currently operates in the castle.
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.