Kiiu vassal stronghold, i.e. Kiiu Tower, is located in Kiiu Manor Park. It was erected in 1517 by Baron von Tiesenhausen and it is the smallest stronghold building in Estonia. There are four floors in the tower and from outside the stone wall is surrounded by a wooden circular balcony. The thickness of walls at the foot is 1.8 metres; the inner diameter is 4.3 metres.
The stronghold was destroyed during the Livonian War and it was restored under the leadership of art historian Villem Raam in 1974. Today a café is open in the citadel.
Reference: VisitEstonia
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.