The electoral hunting lodge Breitenbrunn (Jagdhaus) in the Ore Mountains community of the same name was converted from a watchtower, which was probably built in the 13th or 14th century, is now a ruin under monument protection and is a landmark of the place.
After a Vorwerk of the Schwarzenberg rulership was first built and later a settlement was built, the watchtower was converted into a hunting lodge, accommodation and storage for hunting utensils. The building, which was also used as the forester's house, burned down in 1610, including the newly added third floor and added Wendelstein, and in 1617, was rebuilt and fell into ruin, apparently unused, after 1700.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.