The exact building year of Stahleck castle is not known, but it has been proved that the castle was already occupied since the year 1095. It's first mentioned in documents in the year 1135 under Goswin von Hochstadt. Until 1148 almost 10 years of fight followed for the rights of the Stahleck.
In the year 1156, after the death of Hermann of Stahleck, his stepbrother Konrad von Hohenstaufen became count palatine of Bacharach on the Rhine river. The town of Bacharach, which is situated on the castle mountain, became center and residence of the originating palatine territory on the Rhine river. Castle Stahleck, which was originally the most farthest southern situated property of the Cologne bishops, was assigned from the emporer Barbarossa to his brother Konrad in the year 1190.
In the Thirty Years' War, in year 1644, as the Catholic party banished the French out of the town with 250 cavalries and 450 Cologne foot soldiers, these fled into the castle Stahleck. Colonel of Nievernheimb, commander on the fortress Ehrenbreitstein, let the castle Stahleck near Bacharach at the Rhine river thereupon be fired at without occupying it. Th restoration was made in 1666 by the elector count palatine Carl Ludwig.
Between January and May 1689 the Stahleck castle was exploded by the french troops from Ludwig XIV. 237 years it was in a ruins, until the crown prince of Preußen bought the area in 1828. Rhine river society accomplished restoration work in 1909 and 1910.
Starting at the end of 1965 until May 20, 1967, the youth hostel was further constructed on the castle Stahleck. Thereby the in the substructure still original roman Bergfried of the castle Stahleck with abated wall strength was newly roofed and furnished with new walls. Today it expresses the picture of a medieval castle with different construction phases and is one of the most well-known youth hostels.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.