Château d'Haroué was built between 1720 and 1732 by Germain Boffrand during the period when Lorraine was independent of France, for Marc de Beauvau, prince de Craon, viceroy of Tuscany and constable of Lorraine.
Surprisingly, the architect had to integrate into his plans the four towers and moat of an older medieval château, a consideration for medieval buildings which was unusual for the classicist period. Le château's design also symbolises a year: 365 windows, 52 fireplaces, 12 towers (several included in the buildings) and 4 bridges crossing the moat.
The decoration was largely entrusted to artists from Lorraine : Jean Lamour (1698–1771) for the gates, balconies and staircases, Pillement (1698–1771) for the painted decoration of one of the towers, Barthélemy Guibal (1699–1757), sculptor of the fountains of place Stanislas at Nancy, for the statuary. The park was designed by Emilio Terry.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.