Cortewalle Castle dates back to the 15th century, and is one of the oldest in the Waasland. It is built of white sandstone, in Flemish Renaissance style. For centuries it was in the possession successively of the Triest, Goubau and de Brouchoven de Bergeyck families, until the Brouchovens sold it to the municipality of Beveren, who use it for the storage of the extensive and important De Bergeyck archives.
Today Cortewalle castle hosts the Municipal Local History Museum with a rich collection of lace and a restored Aubusson tapestry.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.