Los Arcos Castle was built around 1474. The square form castle has four corner towers and it was surrounded by a moat. It was built of masonry, dressed stone and brick, as a rectangular enclosure with squat towers at the corners and a keep in the centre. It is not open to visits at the present as it is private property and currently inhabited.
Near the castle they have found the remains of an old Gothic-Mudejar hermitage or basilica and the medieval Castillejo bridge.
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.