Ehrenstein Castle was first time documented in 1331. It was destroyed by Swedish army during the Thirty Years' War and not rebuilt again. Today two towers and some walls remain.
The adjacent Ehrenstein monastery was built by the castle owner Bertram von Nesselrode in 1486-1488. Today the church remains and contains some beautiful medieval glass paintings.
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.