Where the old road to Halmstad crosses Lagan lies Lagaholm’s castle ruin. Lagaholm castle was built in the 1200s and was demolished in the 1600s by order of the king, Karl XI. In the 1930s the ruins were dug out and restored. Now Sydkraft’s operating centre, salmon farm and power station lie on the area. Sydkraft’s exhibition and slide show give a historical flashback to the importance of Lagaholm during the Middle Ages as a stronghold between Sweden and Denmark.
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.