The Kalanti stone church, today part of Uusikaupunki city, was built between years 1430 and 1450. The interior is covered with famous wall paintings signed by Petrus Henriksson in 1470s. The oldest altarpiece in Finland was originally in the church of Kalanti. It was made by German master Francke in the beginning of 15th century and stood in Kalanti church until 1883. According the local legend, collected in the 19th century, the altarpiece was found floating in the sea outside Kalanti. The altarpiece is now located at the National Museum of Finland.
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.