Aggsbach Charterhouse is a former Carthusian monastery in Aggsbach Dorf. The monastery was founded in 1380 by Heidenreich von Maissau. It was dissolved in 1782 in the reforms of Emperor Joseph II. The premises were mostly converted for use as a castle, except for a few portions which were incorporated into the parish priest's farm. The monks' cells and the cloister were demolished. The Carthusian church, with the addition of a tower, remains as the parish church.
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.