The church of Blessed Virgin Mary was originally built in the early 13th century and it was probably the first stone church in Southern Estonia. The current stone church was built in the late 15th century to the grounds of the earlier church. It has been damaged in Livonian Wars and Great Northern War and restored later. The interesting details in the church are the old altar painting The Last Supper (1650) and the altar panels (1647).
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.