Nestled in the hill 300 feet above the city of Heidelberg stands the breath-taking Heidelberg Schloss (castle). The castle is a combination of several buildings surrounding an inner courtyard, put together with a haphazard look. Each building highlights a different period of German architecture. The castle has a history almost as old as the city itself. The first parts of the castle were constructed around 1300, but it wasn?t before Prince Elector Ruprecht III (1398 ? 1410) that the castle was used as a regal residence. Until it was destroyed by lightning in 1764 leaving it permanently uninhabitable, the castle was the residence for most of the Prince Electors. In 1800, Count Charles de Graimberg began the difficult task of conserving the castle ruins. Up until this time, the citizens of Heidelberg had used the castle stones to build new houses.