The current building of Pöide Church is believed to be built on the remains of a chapel built in 13th century. After the conquest of Saaremaa in 1227, the eastern part of Saaremaa belonged to the Livonian Order, who built a fortress at Pöide as their headquarters during the second half of the 13th century. This fortress was destroyed by the Saaremaa natives during the wave of uprisings against the occupying forces that took place in Estonia and Saaremaa during St.George's Night Uprising of 1343. There was a chapel on the southern side of the fortress, and the walls of this chapel form the central part of Pöide church. For its massive form, it is called fortress-church.
The building was looted and burnt during World War II and also used as a storage building. The building suffered severe damages in fire in 1940, when lightning struck the tower. The large crack in the tower from the lightning can still be seen today.Pöide church has been renovated and reconstructed slowly since 1989. Choir-part, stone-altar and vestry room have been renovated. Several big tombstones inside the church are exposed behind glass, showing the importance of the church as a cultural center for nearby communities during previous centuries.
Reference: Wikipedia
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.