The town of Miglionico developed around the imposing Malconsiglio Castle, built in the 8th-9th centuries. With its six towers, it dominated the entire Bradano valley. The name of the castle is linked to the bloody story of the conspiracy of the Barons of the Kingdom of Naples against King Ferdinand I of Aragon (1485). The most particular part is the Hall of the Star also known as the Hall of Spirits where there are niches carved in the walls and support the treasures of the inhabitants.
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.