The original Hainewalde water castle, built under rule of the family von Nositz, was located north of the terraces of the new castle. The only remain of the old water castle, which was demolished in 1780, is the gate lodge with his west-side Renaissance-portal. Schloss (New Castle) was constructed in 1750–1753, along with its Baroque gardens, under the rule of the Kanitz-Kyaw family. It was renovated in 1883, the Baroque elements on the outside façade removed and replaced by 'Italian'-style sgraffito.
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.