The Church of St. Nicholas was first mentioned in 1220 and was expanded over time in the 14th century before taking its final shape in the year 1465. The architectural style is mainly Gothic.
The church consists of three naves. It has well-preserved stain glass windows, and a large rose window over a pointed arched portal, a number of wooden sculptures of saints and paintings that date from different periods. Of particular importance is the large altar and pulpit.
Outside is a tall clock tower with a sundial. Old tombstones line the walls and various paintings from the life of Jesus Christ.
Behind the church is St. Barbara's Chapel. The layout of the chapel is octagonal. It was built by the architect Hans von Burghausen in 1450, who also designed the Hospital Church. The basement served as the ossuary while the main floor was used for religious ceremonies and prayers. It features a number of wooden pews and a wooden Gothic altar, flanked by two altars from the Baroque period. Outside the entrance has a painting depicting Saint Christopher.
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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.