Hückeswagen Castle was first mentioned in 1189. In 1260 the county Hückeswagen was disposed to the counts Berg, and the Hückeswagener counts moved to Moravia. In the future the castle of the countess Margarete von Hochstaden served as a widow's seat. To constant Verpfändungen of Hückeswagen during the following centuries the name changed in 1397 into castle. During the following centuries the castle was mostly in a bad state, until it reached in 1884 at first partially in the possession of the town. Today it accommodates municipal offices and a museum of local history.
One of the most striking components of the arrangement is the donjon which is also called 'scoundrel's tower'. He was probably established in the first third of the 13th century. The oldest view of the castle of Erich Philipp Ploennies at the beginning of the 18th century shows the tower with 23 metres substantially higher than today. The reduction on two floors occurred at rebuilding and protection work at the beginning of the 19th century.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.