The Protestant church of Aldtsjerk or Saint Paul’s church was built in the mid-12th century. It represents the Romanesque style with a triple closed choir built out of brick covered with tuffstone. The tower dates from the 13th century and is like the church build out of brick covered with tuffstone. The church was once a Roman Catholic church dedicated to Saint Paul but became a Protestant church after the protestant reformation. Over time the tower and church where several times changed/converted.
References: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.