Riala Church was documented first time in 1228 and the current nave was built in the late 13th century. It was altered in the late 15th century and again in the 18th century. The free-standing bell tower was erected in the 16th century.
The font is made of Gotland sandstone in the 13th century and crucifix carved during next century. The altar dates from the 18th century.
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.