Heidelberg Castle is a ruin in Germany and landmark of the city of Heidelberg. The castle ruins are among the most important Renaissance structures north of the Alps.
The castle has only been partially rebuilt since its demolition in the 17th and 18th centuries. It is located 80 metres above the city of Heidelberg and therefore dominates the view of the old downtown.
The earliest castle structure was built before 1214 and later expanded into two castles. However, in 1537, a lightning bolt destroyed the upper castle. The present structures had been expanded by 1650, before damage by later wars and fires. In 1764, another lightning bolt caused a fire which destroyed some rebuilt sections.