Sielecki Castle is located on the left bank of the Czarna Przemsza River. Originally a defensive fortification, the castle expanded in 1620 into a four-wing complex with corner towers, perhaps using earlier buildings. The castle was built of broken limestone and brick. Storey building with basement. After the fire in 1824, the castle was rebuilt in 1832, but the east wing with the entrance gate was demolished and the moats were filled. Despite these changes, the original defensive character is evidenced by the shape of the block, four corner towers and projections on the extension of the side wings. It is currently a three-winged building with an open courtyard.
In 1994 the city of Sosnowiec took over the destroyed castle. Currently, the castle houses the Sosnowiec Art Center. This local government institution co-creates the cultural life of the city by organizing exhibitions, concerts and various culture-forming meetings.
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.