The Vattholma ironworks is one of the oldest in Sweden. Smelters are believed to have been active here back as far as the 15th century. Wattholma operated under the Crown until the end of the 16th century. Walloon forging was introduced during the 1600s and was used until the 1870s, when it was replaced by the Lancashire method. Wattholma also featured a blast furnace that was moved in 1758. Bar iron production ceased in 1905, but manufactory smithing and foundry operations continued.
The works were sold in 1939 to a fire appliance store in Stockholm. Housing was added in the 18th and 19th centuries. The old inn with its walled courtyard is found here, along with a storehouse and school. On the opposite side of Fyrisån River is the manorhouse, with its main structure from 1812 and annex from the 1700s. Most of the old buildings were demolished in the early 1970s and replaced with modern residences that resemble the originals.
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.