Heidelberg is a town on the Neckar River in southwestern Germany. It’s known for venerable Heidelberg University, founded in the 14th century. Gothic Heiliggeistkirche church towers over the cafe-lined Marktplatz, a town square in the Altstadt (Old Town).
The castle is a mix of styles from Gothic to Renaissance. Prince Elector Ruprecht III (1398-1410) erected the first building in the inner courtyard as a royal residence. The building was divided into a ground floor made of stone and framework upper levels. Another royal building is located opposite the Ruprecht Building: the Fountain Hall. Prince Elector Philipp (1476-1508) is said to have arranged the transfer of the hall's columns from a decayed palace of Charlemagne from Ingelheim to Heidelberg.
In the 16th and 17th centuries, the Prince Electors added two palace buildings and turned the fortress into a castle. The two dominant buildings at the eastern and northern side of the courtyard were erected during the rule of Ottheinrich (1556-1559) and Friedrich IV (1583-1610). Under Friedrich V (1613-1619), the main building of the west side was erected, the so-called "English Building".
The castle and its garden were destroyed several times during the Thirty Years' War and the Palatine War of Succession. As Prince Elector Karl Theodor tried to restore the castle, lightning struck in 1764, and ended all attempts at rebuilding. Later on, the castle was misused as a quarry; stones from the castle were taken to build new houses in Heidelberg. This was stopped in 1800 by Count Charles de Graimberg, who then began the process of preserving the castle.
Although the interior is in Gothic style, the King's Hall was not built until 1934. Today, the hall is used for festivities, e.g. dinner banquets, balls and theatre performances. During the Heidelberg Castle Festival in the summer, the courtyard is the site of open air musicals, operas, theatre performances, and classical concerts performed by the Heidelberg Philharmonics.
The castle is surrounded by a park, where the famous poet Johann von Goethe once walked. The Heidelberger Bergbahn funicular railway runs from Kornmakt to the summit of the Königstuhl via the castle.
The castle looks over the entire city of Heidelberg and the Neckar Valley.