St Catharine's Church is a Grade I listed building, built between 1875 and 1882. The church was constructed in the Decorated Gothic style, and dressed with Forest of Dean sandstone. John Prichard, Llandaff's diocesan architect, who also worked on the restoration of Llandaff Cathedral, was heavily involved in the design project, although the building work was superintended by a local architect named John Jones. It replaced the older St Baglan's Church, a pre-Norman building that was largely destroyed by a fire in 1954.
The interior uses Quarella stone, Forest of Dean sandstone and 'Penarth' alabaster to create a polychromatic effect. The chancel is decorated with bands of marble and has a marble floor inlaid with Italian mosaic tiles. A brass memorial plaque commemorates Griffith Llewellyn and his wife Madelina (née Grenfell), both of whom are buried in the churchyard, close to the ruins of the original Saint Baglan's church.
Stained glass windows in the church include designs by William Morris (St Cecilia with Musical Angels) and Edward Burne-Jones (Crucifixion with the Virgin Mary and St John), as well as a Celtic Studios design installed in 1972.
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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.