The stone church of Hollola was built between 1495-1510 during the third wave of Finnish grey stone churches. Church is one of the biggest medieval churches in Finland and important medieval landmark in Päijät-Häme area. According to Reformation policies, the interior was remodeled in the 17th century.
Archeologists have found remains of the Iron Age settlement around the church. Area has been some kind of administrative and commercial centre for local people.
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.