Hyrynsalmi church was built in 1786 and it was designed by Jacob Rijf. It is one of the most significant wooden churches built in Finland in the 18th century.The separate bell tower was erected in 1840. The altarpiece painted by J. G. Hedman dates back to 1830.
During World War II corpses from the Suomussalmi battlefield were brought into this church to be returned to their home parishes for burial. The church is one of the few buildings, which survived when German troops burnt the village in the Lapland War (1944).
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.