Taivassalo Church is the oldest of the three medieval stone churches in Finland that are dedicated to the Holy Cross. The construction of the church is believed to have begun between the years 1425 to 1440. In 1460s, the third aisle was built and the inner walls were decorated with new murals. It was the first time in Finland that frescos were painted to nearly all important surfaces of a church by a group of professional artists.
The medieval altarpiece as well as wooden sculptures of Taivassalo Church were donated to The National Museum of Finland in 1890. However, Taivassalo Church still has a magnificent triumph crucifix above the altar, in front of the chancel window. This crucifix is one of the oldest and best preserved crucifixes in Finland. The rococo front of the organ, which is unusual by Finnish standards, has remained intact ever since 1767 although the organ has been replaced several times.
As a whole, the church with its murals looks much the same as it would have looked at the end of the Middle Ages.
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.