Oleśnica Castle was erected in 1542-1561, replacing a Gothic fortress from the thirteenth century. It was the seat of the Dukes of Oleśnica until the nineteenth century. A fortified settlement was mentioned before the year 1238, and the first record of the castle dates from 1292.
After World War II, the surviving buildings held Hungarian and Italian prisoners of war. Later, there was the Soviet branch office of the International Committee of the Red Cross. In the 1970s the castle underwent another renovation and it became a branch of the Archaeological Museum in Wroclaw, until abandoned in 1993. It has since been reoccupied by the Voluntary Labour Corps.
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.