Husaby Church is one of the most interesting historical sites in Sweden. The first stave church was built probably in the 10th century. Olof Skötkonung, the first Christian king of Sweden, is rumoured to have allowed himself to be baptised at a well by the church in 1008. Husaby was also the seat of bishop until 1150s.
The present church was built in the early 1100s and influenced by German and English missionaries. Architecturally, it is remarkable for its steep walls and high towers, arguably the only Romanesque architecture in Sweden of that kind. Arches were added in the 15th century.
The most interesting artefact inside is the medieval bishop’s seat. There are also two graves, which (according to tradition) belong to King Olof Skötkonung and his wife Estrid.
References:First record of Kastelholma (or Kastelholm) castle is from the year 1388 in the contract of Queen Margaret I of Denmark, where a large portion of the inheritance of Bo Jonsson Grip was given to the queen. The heyday of the castle was in the 15th and 16th centuries when it was administrated by Danish and Swedish kings and stewards of the realms. Kastelhoma was expanded and enhanced several times.
In the end of 16th century castle was owned by the previous queen Catherine Jagellon (Stenbock), an enemy of the King of Sweden Eric XIV. King Eric conquered Kastelholma in 1599 and all defending officers were taken to Turku and executed. The castle was damaged under the siege and it took 30 years to renovate it.
In 1634 Åland was joined with the County of Åbo and Björneborg and Kastelholma lost its administrative status.