There has been an ironworks in Jädersbruk since Middle Ages. It was originally owned by Julita Abbey. After Reformation Jädersbruk was confiscated to the Crown. King Gustav Vasa set up there the first arms manufactory “Arboga faktori, Jäders Bruk” to decrease the dependence of foreign weapons.
Weapons fere forged until the end of 17th century when the ironworks gradually started manufacturing of civilian products. The ironworks flourished until the early 20th century. Today the manor house and workers’ cottages remain and there are art and handicraft workshops.
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.