Valangin castle was a residence of the local lords from mid-12th century to 1566. The oldest visible remains date from the 13th century. It consists of a courtyard surrounded by a rampart and a 'donjon' (keep), which hosts the current museum.
Since 1430 the castle was altered with semicircular towers to be defended against the firearms. The castle was damaged by fire in 1747 which destroyed a whole wing. The dungeon was restored and partly rebuilt between 1769 and 1772. Today Valangin castle is a 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.