The present building of Nysted Church dates back to c. 1300. Originally it consisted of a central nave with a three sided apse to the east. The impressive tower was built a century later. In 1643 a spire was added, and in 1935 this was covered by copper. The Raben-Levtzau family of Aalholm Castle had their own chapel built in 1782. According a rumour there is a secret underground passage from the castle to the church. It hasn't been however found. The church was thoroughly renovated in 1864.
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.