Janowiec Castle was most likely built by Mikołaj Firlej between 1508 and 1526, on a steep Vistulan hillside in Janowiec. It expanded by his son, Piotr, the Voivode of the Ruthenian Voivodeship. The bastion, used as a residence, was destroyed by the Swedish army in 1655 during The Deluge.
Although the following owners of the castle did their very best to rebuild the castle, the castle never managed to regain its former glory. In 1928, an archaeologist, Leon Kozłowski had taken over the castle, but his plans to reconstruct the castle were stopped by the Second World War. After the Second World War, the castle was left in its former state, being one of many private castles. In 1975, the castle was bought by the Nadwiślańskie Museum in Kazimierz Dolny in Poland.
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.