Arreskov was owned by the Crown and in 1241 Duke Abel inherited the castle from his father, King Valdemar Sejr. Some years later, the castle was captured and destroyed by his brother Erik Plovpenning. Arreskov was captured once again and destroyed in 1264 by King Erik Glipping. The present castle is third on the site, built in 1558. The castle mound is about 100 m x 35 m. The rectangular castle embankment is protected by a moat and circular outer ramparts. Today, the ramparts are partly destroyed and the castle embankment is overgrown. Not far from Gammel Arreskov stands another castle mound called Perdeholm. The castle and park is open by appointment.
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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.