The town of Kętrzyn (until 1946 Rastenburg) was founded by the Teutonic Knights at the Prussian settlement called Rast. Initially there was a wooden watchtower, around which developed a settlement. In 1357 the commander of Bałga Johann Schindekopf granted the settlement civic rights. Shortly thereafter, in the city began construction of the defensive church dedicated to St. George, castle and defense walls.
The Kętrzyn castle was raised in the second half of the 14th century in the south-west corner of the urban battlements. Castle contained a chapel, bakery, kitchen, mill, malt house, brewery, the meat store, grain silos, storage, armory and a powder magazine. The most representative northern wing was occupied by pfleger - prosecutor, official position of the Teutonic Order. After the year of 1525 the castle became the county seat of the Duke of Prussia. In 1910 the castle was taken over by the municipal authorities, Until World War II there was a finance office and housing for authority officials. Initially it had a triangular winged structure, closed on the west side wall with a gate. Numerous of reconstructions over the centuries, adapting the object to perform administrative functions and residential buildings changed the face of the object. In January 1945, the castle was burnt down. During the reconstruction of the castle was restored in the years 1962-1966 the Gothic character of the building. Currently in the Kętrzyn's castle are functioning: the public library and museum by the name of Wojciech Kętrzyński, and as well as with the interesting regional collections.
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.