Coloma castle was built around 1515. It is a square building with square corner towers and a pear-shaped roof and surrounded by a moat. The castle has been completely restored and serves as a municipal cultural center. In the castle park are some interesting buildings such as the former carriage house of 1731 (now a cozy tavern) and a garden pavilion with stair tower. The Rose Garden of Coloma is the largest in Europe. The garden has an area of 15 hectares.
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.