Alanís castle has Arab origins. The town was conquered by Ferdinand III in 1249 and the castle was rebuilt in 1392. It has a hexagonal floor plan, with a tower and barbican, which has now disappeared. Its walls are 2.3 metres wide and 6.5 metres high, leaving only one access to the enclosure on the north side, from where the village can be seen.
Th castle was attacked by the French during the Napoleonic occupation, who dynamited one of its walls, the southwest one, and the ruins are still preserved today.
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.