The Cremona Baptistery is annexed to the city's Cathedral. Built in 1167, it is characterized by an octagonal plan, a reference to the cult of St. Ambrose of Milan, symbolizing the Eight Day of Resurrection and, thenceforth, the Baptism. The edifice mixes Romanesque and Lombard-Gothic styles, the latter evident in the preference for bare brickwork walls. To the 16th century restorations belong the marble cover of some walls, the pavement and the baptismal font (1531) and the narthex (1588) of the entrance, in Romanesque style, work by Angelo Nani.
The interior has a 14th-century Crucifix, over the St. John altar, and two wooden statues portraying 'St. Philip Neri' and 'St. John the Baptist' by Giovanni Bertesi. Over the ceiling is a 12th-century statue of the Archangel Gabriel.
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.