St. Olav's Church stone church was built before 1150 and probably Telemark's largest stone church in former times. It had a number of unusual building features, including lektorium and a separate room for earthly values, which today is called 'Mary's Chapel'. Probably the church was the main church in Grenland, a kind of 'county church' and therefore had the highest status of all churches in the area. Today the church ruins are located next to the newer Bamble Church.
References: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.