Santa Marta was initially built in the late 15th-century but rebuilt at the end of the 16th century by the Confraternity of Santa Marta, a confraternity of disciplinanti (or flagellants). To the right of the entrance, they built an oratory.
Of the original decoration only one altar remains, and traces of frescoes in the presbytery and some lunettes in the walls of the oratory. Deconsecrated after World War Two, it became the property of the Commune of Ivrea in the 1970s, who converted it into a conference hall. The Baroque portal was moved to the parish church of San Bernardino in Ivrea.
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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.