Eynhallow Church is probably the ruin of a 12th-century Benedicitne monastery. Because of the name of the isle it is likely that Eynhallow was an important religious centre. Eyin-Helha is Old Norse for Holy Isle.
Eynhallow Church was deserted before the reformation (circa 1560). The church was converted into dwellings in the 16th century. In 1851 the inhabitants of Eynhallow were transferred elsewhere and the church and other buildings were stripped of their roofs. The ruin was consolidated by W.R. Lethaby in 1897.
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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.