The museum's function comprise the coastline and northern area of the former Vaasa province. The collections relate to both peasant and upper-class culture, the history of the town of Vaasa and Ostrobothnia. There are for example the coin collection of Mauritz Hallberg, the Hedman collection of visual and industrial art from different countries, mostly Dutch and Italian, the oldest dating from the 15th century. The Finnish art collection is from the 19th and 20th centuries.
Terranova-Kvarkens Nature Centre is also located to the same building. It exhibits fauna and geology of the Kvarken area, the landrising and the ice age, information in nature tourism and contacts also information in the Forest and Park Services, virtual aquarium, natural history collections of Ostrobotnia Australis, Wildlife Nature Film Festivals.
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.