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.
Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.