Marienmünster is well known for the former Marienmünster Abbey Church with its organ, which is well worth seeing and hearing. Marienmünster Abbey is a former Benedictine monastery, dissolved in 1803. Founded in 1127, the monastery reached its peak in the 12th and 13th centuries. During the Thirty Years' War, the monastery and the church were badly damaged and had to be rebuilt from 1661 onwards. From 1965 to 2014, Passionists lived there and pastored the surrounding parishes.
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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.