Skelby church was built originally around the year 1200 and the tower was added in 1400s. In 1857 the church was in bad shape and the nave and choir were rebuilt of yellow bricks. On the northern side of the nave, the ruling body of Niels Amager set up a chalk stone epitafium. There is an interesting octagonal limestone font from 1175-1200, made in Gotland.
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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.