Construction of the Tui Cathedral began in 1120, but it was not consecrated until 1225 under the reign of Alfonso IX. It looks like a fortress because of its crenellated towers. Its structure is clearly Romanesque and later diverse decorative Gothic elements were added. From the Romanesque period there are the capitals that top the interior columns, and from the Gothic period there is the portico of the main entrance.
The main chapel located in the choir was completed in 1699 by Castro Canseco. The interior has a large prominent retablo de la Expectacion, and a large altar of relics in the Chapel of the Relics.
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.