Montánchez Castle was built in the 12th century by Almohad occupation. Three water cisterns still exist from that age. After Christian Reconquista, under the administration of the Order of Santiago, a large number of elements were added to the castle, including the wall which surrounds the enclosure. Additionally, in the interior you will still find the keep and the wine cellars, and on the outside a pond and a hermitage built during the 17th century.
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.