Bjolderup Church was built in the 12th century probably to replace a wooden church. It was expanded in the 15th century and and the tower was added in 1589. It was burned in the war or 1624-1627. In the church there are many paintings from 1778 painted by the Aabenraa artist Jess Jessen. The church greatest treasure is the 'Bjolderup-stone', a tombstone from the grave of Ketil Urnes that now lies in as a part of the church floor and dates from year 1200.
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.