The Church of San Sebastiano dates from the 16th century and is located in Piazza Garibaldi, in front of the Cathedral. It was built as a tribute to said Saint by the people in gratitude for deliverance from the plague. In 1711 it was altered along its whole length to make space for the Piazza Garibaldi. As a result, a new façade was designed by Pasquale Saetta in the late 19th century. It is embellished with columns employing all three classical architectural orders: Doric bases, Ionicin central sections and Corinthian crowns. There are also niches containing statues of the sculptor Francesco Biangardi, who worked in Caltanissetta during the late 19th century. The centre sculptures represent the saints Peter and Paul; the upper band shows San Sebastian pierced with arrows, being created in memory of his martyrdom.
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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.