The St. John’s (Jaani) church in Valga is one of the most beautiful churches in Estonia. The construction started in 1787, but it was not completed until 1816. The church represents Baroque and Classicism styles. It was built according to the design of architect Christoph Haberland and it is the only church in Estonia with an oval ground plan. The unique organ has been preserved in its original shape and it is the only instrument built by Friedrich Ladegast still left in Estonia.
Reference: Visit Estonia
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.