Château de Buzet-sur-Baïse was built originally in the 10th century and rebuilt in the 12th century. There was actually two castles on the site and the church. Castles were burned down in 1293-1294 by the English army. Today the oldest parts date from the late 13th century. The chateau was restored in the 17th century. With its outbuildings and its park, it was acquired in 2018 by the Buzet winegrowers cooperative cellar and must occasionally host cultural or festive events. It is not open to visitors.
Until then, the old 13th century castle chapel, altered in the 16th century, served as a parish church. Decommissioned after part of the vault collapsed in 1849, its remains remain.
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.