The Château du Nideck is a ruined castle located in the commune of Oberhaslach. Situated on the heights of the road from Oberhaslach to Wangenbourg, the castle was first mentioned in a charter in 1264, as the property of sire Bourckard, burgrave of Nideck. In 1336 there is mention of a second castle, below the first, fief of the Bishop of Strasbourg and held by the landgraves of Basse-Alsace.
Nideck then became the property of the seigneurs of the region, in the 14th and 15th centuries, according to the various regional conflicts and other events of the time. It was besieged by the Strasbourgeois in 1448. The Müllenheim family took possession of the castle and kept it until 1509. It was finally destroyed by a fire in 1636.
The castle overlooks the Nideck waterfall and is easily reached on foot. The castle has been listed since 1898 by the French Ministry of Culture as a monument historique and is owned by the state.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.