Château du Kagenfels (also known as Kaguenfels or Kagenburg) is a ruined castle situated in the Forest of Obernai, in the commune of Ottrott. The castle was constructed in 1262 by Albrecht von Kage, Ministerialis of the Bishop of Strasbourg. The castle passed successively to the nobles of Hohenstein, then to Utenheim and Ramstein, who sold it in 1559 to Lucas Wischbech who repaired and enlarged it. In 1563, the town of Obernai bought it. It was destroyed during the Thirty Years War and is recorded as ruins in 1664.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.