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:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.