The Church of St. Michael is supposed to be built in the end of the 13th century, but another theories suggest sometime between the beginning of the 12th century or in the end of the 15th century. The church replaced an earlier wooden church from around the 1000s. The church has one of the best preserved medieval interior in Finland. There are many medieval wooden sculptures decorating the interior, and the wall paintings are from the middle of the 15th century. Finstrom Church is one of the biggest churches in Aland.
References: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.