The Chapel of Saint Germanus (Chapelle Saint-Germain) is one of the earliest surviving places of Christian worship in the Cotentin Peninsula. It is a small building with walls built from small pieces of shale arranged in a herringbone pattern. The chapel consists of a short nave, and transepts and a choir each formed from an identical apse with half domed roofs. This tri-lobate plan, which is unusual, is the result of a reconstruction in the 9th or 10th century on remains of a palaeo-Christian basilica which has been revealed by archaeological excavations. In the 17th century, the chapel was topped by a tower which in turn replaced an older tower structure.
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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.