Fortified with angular bastions around a central courtyard and supported by a broad embankment, this mighty fort complex was built between 1818 and 1831 by the Savoy Corps of Engineers. It was able to house 840 soldiers and 41,000 kilos of ammunition in its gunpowder magazine; it also had 1500 square meters of storehouses.
Renovation was carried out between the late 20th century and the early 21st century, subsidised by the European Union.
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.