There are four runestones located at Aspa, which is about six kilometers north of Runtuna, where a road has passed a creek since prehistoric times. One of the stones is the oldest surviving native Scandinavian source that mentions the kingdom of Sweden beside the runestones DR 344 and DR 216. Another stone Sö 137 is raised in memory of a Viking who had spent time in the west.
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.