The name Bernegg was first mentioned in 1292. Around 1365 the estate was managed by Heinrich Gottschalk. According to unconfirmed documents, the house was looted by the Confederates in 1499 and then rebuilt. In 1702, the Bernegg passed into the possession of Johann Ulrich Merhart-Mallenbrey. To this day, Merhart family still owns the house.
In 1786, Maximilian Christof von Rodt, Bishop of Constance, built the four-storey central building.
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.