Prandau-Normann Castle was remodelled in the second half of the 18th and in the first half of the 19th century, represents a core of the building complex. It consists of a cylindrical medieval tower, a Gothic chapel and a courtyard. In the frame of the restoration project of the complex, the improvement of the foundations and the chapel vaults, as well as its interior designing have been executed.
The interior design of the castle, along with the improvement of the earlier and the production of the new exterior and interior woodwork, according to the existing patterns, have followed. The interior spaces of the castle have been designed in such a way to serve the needs of the current user, the Museum of the Town of Valpovo.
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.