Altenburg castle is perched on top of Bamberg's highest hill and is one of Bamberg's major landmarks. The castle was first mentioned in 1109 and was used at this time as a refuge. In the 14th and 15th centuries it served as a richly furnished residence for Bamberg's bishops, but was almost completely destroyed in 1553 by margrave Alfred Alcibiades von Brandenburg-Kulmbach in the second margrave war.
The only remains of the medieval construction are the 33 metre keep from the 13th century and parts of the surrounding wall. An iron basket hangs from the upper section of the tower which was used to send fire signals to Giechburg castle near Scheßlitz, 20km away.
In the Romance period, Altenburg was rebuilt. E.T.A. Hoffmann retreated to one of the wall towers in 1812, to which the 'Hoffmannsklause' restaurant in the new building of the former palace (1901/02) owes its name. The terrace commands a panoramic view of the episcopal town and the surrounding region.
The restaurant was formed after the takeover by the 'Altenburg club'. The premises were located as it is today in the cultivation of the gatehouse. The kitchen, a vaulted room was built in 1834. In the last quarter of the 19th Century the premises has been newly decorated. Lippel family took over the restaurant in 1972.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.