The structure of the present St Mary's Church is thought to originate from the 13th century, although because the churchyard is round in shape, it is likely that there had been an earlier church on the site. Additions and modifications were made during the following centuries. Dating from the pre-Reformation period are the east window, the roof and the rood screen. The bellcote is dated 1688. The church was restored in 1857. the restoration included removal of the west gallery. Encaustic tiles were laid in the sanctuary in 1907.
The floor of the nave is flagged, the chancel has a wood-block floor, and the sanctuary has encaustic tiles. The outstanding feature of the interior is the rood screen which has retained its loft. It is finely carved with Perpendicular features. The font is dated 1665. The rest of the furniture dates from the 19th century. This includes a large, carved, octagonal pulpit, an oak altar, and an octagonal font.
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.