Rühn Abbey is a former Cistercian monastery founded by Brunward, bishop of Schwerin in 1232. Already on May 29, 1292 the monastery was burned down completely. After reconstruction 30-40 nuns lived, prayed and worked there.
After the Reformation Duke Ulrich gave the monastery to his wife Elisabeth. She founded in Rühn the first girls' school in Mecklenburg. Numerous renovations and extensions were made then.
In the Thirty Years War the monastery was destroyed. During the age of the Duchess Sophie Agnes von Mecklenburg (1625-1694), it was rebuilt with a park with linden alley in the former monastery garden. Until 2008 the site changed hands several times and functioned for example as an orphan house. Since 2008 it has been owned by the Klosterverein Rühn e.V foundation.
The abbey church was completed in 1270.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.