Gross Zicker brick church was erected with a flat-roofed nave and a rib-vaulted choir around 1360. In 1835 the half-timbered roof tower was rebuilt. Among the preserved medieval furnishings are the altar cross, a bronze bell and the tabernacle, which was carved from a single oak trunk. The Baroque pulpit is also worth mentioning (built in 1653).
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.