Château de Buchenek is a castle in the commune of Soultz-Haut-Rhin. Dating from the second half of the 13th century, it was altered, possibly in the 14th century, and in the 16th century.
The castle was first recorded in 1251. The logis, of a rectangular plan, possibly still dates from this period at the lower level; it was altered in the 14th century (there is evidence of building work) as well as in the second half of the 16th century (staircase tower). Restored after the Thirty Years' War, the castle was sold as national property. In the 19th century it was used as a factory. Bought by the town in 1976, the castle has had a significant restoration and, since 1990, has housed the municipal museum.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.