Tirsbæk estate was first time mentioned in 1401. The current castle was built in 1550, while the tower and west wing were added in 1577. The park was finished in 1745, among other things with a vineyard - the oldest existing in Denmark. Since 1912, the place been owned by Algreen-Ussing family. They run Tirsbæk as a combined arm and forestry as well as rental of homes for private persons and companies. The former stable has been converted to an exclusive restaurant, Restaurant Slotsstalden. The castle is not open to the public, but a Christmas market is held every year, where it is possible to walk around the yard and a few of the former farm buildings.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.