Barry Castle was a fortified manor house built on the site of an earlier Norman structure. It was raised by the powerful de Barry family, who played an important role in both the conquest of South Wales and Ireland. The structure was ruinous by the sixteenth century.
By the late 13th century the castle had two stone buildings on the east and west sides of a courtyard, but nothing now remains of these above ground. Early in the 14th century the castle was strengthened by the addition of a large hall and gatehouse on its south side, and the ruins of these can be seen today.
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.