The Genoese Citadel is the main part of the town of Calvi, and its most important historical monument. It was a military outpost in the 15th century that helped guard the city against attacks from Franco-Turkish raiders to Anglo-Corsican armies. Inside the battlements, don’t miss the well-proportioned Caserne Sampiero, a military barracks that once served as the Genoese administration's seat of power, and the 13th-century Cathédrale St-Jean Baptiste, whose most celebrated relic is the ebony Christ des Miracles, credited with saving Calvi from Saracen invasion in 1553.
The citadel sits high above Calvi port from where it towers over the sea. From up here you get some great views of the coast and harbour.
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.