Capilla Castle was built by Moors to the site of ancient Roman fortifications. It was conquered by Christian king Ferdinand III of Castile and León in 1226 and rebuilt soon after. It stands on a crag where it reveals its structure in the shape of an irregular polygon attempting to adapt to the abrupt terrain. A barbican defends the main door, which leads onto the two courtyards. Inside, the cylindrical towers, the half-demolished allure and the remains of a machicolation give you an idea of the defensive nature this castle had.
In spite of its current appearance, you can still see the ruins of the old Arabic walls, both on the south side and the north, and the original stone paving of the staircases and rooms.
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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.