Tranekær Castle was originally erected as a defensive fortress in the 13th century. The oldest part is the north wing, which dates back to about 1200. The 3m thick walls were added in the 14th century. The castle has been remodelled many times and today has two wings and an octagonal stair tower with a tall spire. It has belonged to the Ahlefeldt-Laurvig family for about 350 years. There is no admittance to the castle itself, but the castle park is open to the public.
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.