Aldealseñor medieval palace once belonged to the López de Salcedo family, due to the fact that on the façade you can see their coat of arms. It was built between the 14th and 16th centuries and it has a great tower that stands 26 metres tall. Due to the orientation of the tower, instead of being used as a defensive structure, it seems to have been just a decorative feature of the palace. The spectacular façade has two entryways, beautiful ashlar windows and doors, and the coat of arms and medallions.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.