The church of Saint Charles in Arona was designed by architect Francesco Maria Richini and built starting from 1614.
The building consists of a single large square room in a baroque style. The motto of the Borromeo family “Humilitas” is written in the centre of the black and white marble floor. The inside of the late baroque dome was painted in the early XVIII century.
From the two doors either side of the altar, you reach a corridor that encircles a chapel dedicated to the birth of Saint Charles. This room is a reproduction of the “room of the three lakes”: in fact, some parts of the room of the castle, where the saint was born, were brought here in order to allow better access to the pilgrims. In the chapel, two closets with wood inlay doors, preserve relics of the saint.
In the same corridor there is a sedan chair, used by Saint Charles, and a wooden model of Milan Cathedral made by the seminarists of the local seminary, on occasion of the third centenary of the saint’s death.
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.