The Brusselpoort is the sole remaining city gate of the original twelve gates of the city of Mechelen. This imposing structure dates from the 13th century. Because of its exceptional height, towering above the other gates, it was also called the 'Overste poort' (superior gate). In the 16th century, the towers were lowered and the roof construction was altered to the present configuration. In the course of the centuries, the building had many different uses from police station to youth center, from duty collector's office to artist's workshop.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.