The castle in Stapelen was first time mentioned in 1293 when it was donated to Willem I van Boxtel. Hendrik Mahie restored the castle in the 19th century to the current Neo-Gothic appearance. The oldest parts of the castle, like the octagonal tower, date from the Middle Ages and the walls from the 16th century. The chapel has a altar from the 17th century. Today Stapelen castle is a monastery.
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.