Månstorp was an old manor, Mogenstrup. Its first known owner belonged to the Danish family Hack. Later it was owned by the family Bille, notably Eske Bille who furnished Månstorp with all the luxury of the time. The main building was surrounded by a circular wall and moat. As part of the Scanian compensation estates for the island of Bornholm it passed from the Danish to the Swedish Crown. The castle was given to the Governor General of Scania, Lord High Admiral Gustav Otto Stenbock but later served as the colonel's residence.
During the war from 1675-1679 the castle was occupied by the Swedes and destroyed in 1678. The castle was never reconstructed following its destruction, tumbling down even more to become the ruin it is today.
References: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.