The Old Church in Sipoo was built in 1450-1454 by the same unknown architect who designed for example Porvoo, Pernaja and Pyhtää churches.
There are several wall paintings inside the church from the end of 15th century.
Allan Neil, you were right. The photo, now removed, was from the "new" church of Sipoo.
This is NOT the interior of St. Sigfrids in Sipoo, 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.