In the Middle Ages Nowy Jasiniec castle served as a border stronghold on the trade route from Polish to Pomesania. It was conquered and rebuilt by the Teutonic Order in the 14h century. During the wars between Teutonic Order and Poland it was destroyed and then rebuilt again in 1454. Between 1466-1772 Nowy Jasiniec was the seat of local lords. Between 1773-1846 the castle served as an evangelical church. Later it fell into disrepair and is today in ruins.
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.