The first written record of a church on the site of current Bladåker Church dates from 1316. The presently visible church, however, dates from the late 15th or early 16th century, with the exception of the sacristy (13th century) which is the only remains of the earlier, probably otherwise wooden, church. The church is constructed of fieldstone, with brick having been used for details and decorations in the façade. The external bell tower, made of wood, was erected in 1748. Inside, the church is decorated with frescos, dating from 1623. These were painted over during the 18th century but have since been restored. Among the church furnishings, a late medieval sculpture of the Holy Virgin and a number of wooden funeral coat of arms from the local nobility can be mentioned. The altarpiece is especially noteworthy as it was painted by Anna Maria Ehrenstrahl and donated by her to the church.
The church lies in a small hamlet, containing several well-preserved historical farmhouses and the former church school.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.