St. Birgitta Church, which lies by the bridge crossing the river of Nykarleby, is one of the most famous sights of the town. The church was built in 1708 and is considered one of the most beautiful in Ostrobothnia. The ceiling paintings in the church date from the 18th century and are the work of Daniel Hjulström and Johan Alm. The paintings on the windows behind the altar were painted by Lennart Segerstråhle in 1940. The church also has a Thelin organ from 1786.
Reference: Uusikaarlepyy municipality
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.