St Pol de Léon's Church is said to have been founded in 490 by Paul Aurelian, a Welsh saint. The church building is medieval but was largely destroyed in a raid by the Spanish in 1595. It was rebuilt by 1600. The parish tower is constructed of granite with double buttresses. It is 27m tall and is surmounted with a turret 6.1 m tall, which serves as a daymark for shipping in Mount's Bay. The tower contains six bells.
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.