The Sant Antoni Castle is located in the Spanish village of Fornells, in the municipality of Es Mercadal. It was built in the 17th century in the local harbour and due to this building, the town was born.
Only some ruins are left from the structure, as it was dismantled by the Spanish after the British domination, just like St. Philip's Castle. Not far from there, there is the Fornells Tower, a defensive tower whose objective was protecting the castle from enemy attacks.
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.