Santa Maria della Passione was initially built in 1496 for the Order of Canons Lateran. The church plan as we see today was based on initial designs of Giovanni Antonio Amadeo, but realized as a centralized greek cross design by Giovanni Battagio. The architect Cristoforo Lombardo designed the large dome to replace the prior crumbling structure. By the late 16th century, under the design of Martino Bassi, the nave acquired a longer longitudinal axis, conforming with the structure of post-Reformation churches. The facade has a series of panels depicting the Passion of Christ. The late Baroque architect and sculptor Giuseppe Rusnati designed the ornate facade.
The interior and the canon's rooms contain a cycle of monumental frescoes by Ambrogio Bergognone completed in around 1510-1515. They depict Christ and the Apostles in the church, and Saints and Popes in elsewhere. The basilica has two organs: the one on right by the Antegnati Family, the one on left, by Valvassori.
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.