According to tradition, the Irish bishop Kilian were killed with his fellows at the site of today Neumünster church. Bishop Megingoz built the first church on the site as a memorial for martyrs in the 8th century.
The next church was built around 1060 and renewed in 1250. The current Baroque appearance dates from the 18th century (1711-1722). In World War II the church was partly destroyed and restored later.
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.