On the northern slope of the Königstuhl above the Altstadt am Neckar, Heidelberg Castle forms a dominant element of the cityscape and serves as a central symbol of the city’s history. The ruins, made of red Neckar Valley sandstone, mark the site where a medieval fortress once developed into the representative residence of the Electors of the Palatinate.
For almost three centuries the castle served as a centre of courtly representation and administration within the Holy Roman Empire. In the late 17th century it was severely damaged in the War of the Palatine Succession; particularly dramatic was the blowing up of towers and walls by French sappers on 6 September 1693. A subsequent fire caused by a lightning strike on 24 June 1764 destroyed further parts of the complex, after which a full restoration was abandoned and the residence was relocated to the valley.
In the 19th century the ruin became a symbol of romantic transience. Intensive documentation and the efforts of a long-serving custodian rescued the building from further decay and at the same time created collections that later formed the basis of museum institutions. The public dispute over the correct way to secure or rebuild the ruin shaped the practice of monument preservation: an expert commission ultimately decided in favour of preserving the ruined appearance; only parts of the Friedrichsbau were restored around the turn of the 20th century.
From an architectural-historical perspective the castle contains evidence of several stylistic periods; the Ottheinrichsbau is regarded as an outstanding example of German Mannerism. Today the property belongs to the state and is administered by the Staatlichen Schlössern und Gärten Baden-Württemberg. The complex, with its viewing terraces, distinctive towers and palace façades, and the Deutsche Apotheken-Museum housed in the eastern part, make Heidelberg Castle a significant cultural site and one of the most visited attractions in Europe.