Cittadella is a medieval walled city founded in the 13th century as a military outpost of Padua. The surrounding wall has been restored and is 1,461 metres in circumference with a diameter of around 450 metres. There are four gates which roughly correspond the points of the compass.
The town was founded in 1220 by the Paduans to counterbalance the fortification of Castelfranco. It was built in successive stages in a polygonal shape on orthogonal axes through the construction of 32 large and small towers, with the formation of a protective moat and with four drawbridges next to the four entrance gates.
Its walls, 14 to 16 metres tall, were built with the 'box masonry': two parallel walls filled with a sturdy core of stones and hot slaked lime totaling a thickness of about 2.10 metres.
The walls today are all intact except for a stretch destroyed in the 16th century during the Cambrai war, and the skilled detail of the construction are still easily visible. It has as many as seven different construction techniques characterized by the alteration of courses in brick and those in river rocks mixed with brick can be recognized.
Among the elements of interest, the Rocca di Porta Bassano still retains the defense apparatus of the keep and entrance gates. The Casa del Capitano (Captain's House) is found inside the Rocca (Fortress). Restoration has uncovered frescoes dating to the period of the Carraresi, Malatesta, Sanseverino and Borromeo families. They hand down an out-and-out historical account of the events that occurred between 1260 and 1600, almost replacing written documents.
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.