Montfort Castle was built by the Counts of Veldenz around the year 1200. The first known dweller at the castle was Eberhard von Lautern (1182-1240). Lautern family owned the castle until 1432. In 1456 the army of archbishop of Mainz and Elector Palatine Frederick I destroyed the castle in local feud.
Despite some repairs Montfort stayed ruined several centuries until the remains where repaired in the 20th century. Today the castle can be visited free. There is also a small museum.
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.