Resmo Church was built in the early 11th century and it is one of the oldest still used church in Sweden. The apsis, nave and western tower date from the original church. Wooden arches and the sacristy were added in the 18th century. There were originally two towers, but the eastern one was demolished in 1826.
There are some frescoes remaining from the late 12th century. The interior originate mainly from the 18th century.
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.