Palace of Anna Vasa, a Swedish Princess, was built before 1564 at the Teutonic castle area by the Brodnica County starost Rafał Działyński, partly with the use of the Gothic walls. The palace was rebuilt and expanded as a residence by Anna Vasa of Sweden in the years 1605-1616 then it was the seat of successive starosts. Burned by Russians in 1945 and reconstructed in 1969. During its existence there resided starosts of prominent families. From the early 17th century Brodnica county was granted to members of the royal family. Besides Anna Vasa of Sweden the Brodnica starosts were: Constance wife of Polish King Sigismund III Vasa, his daughter Anna Catherine, wife of King Wladyslaw IV - Cecilia Renata, and his advisor and the Great Crown Chancellor Jerzy Tęczyn Ossoliński, Maria Kazimiera - wife of John III Sobieski, Crown Hetman Marcin Kalinowski and the Great crown Marshal Marshal Francis Balinski. Currently it houses a library and museum.
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.