About 12 kilometers west of Heidelberg, in the Rhine plain, is Schwetzingen, famous for its spectacular 18th-century palace.
Schloss Schwetzingen was built as the summer residence of the Electors of the Palatinate, and today is as well known for its superb program of summer concerts as it is for its lovely gardens.
Covering more than 180 acres, Schlossgarten was laid out in a mix of French and English styles and contains a number of 18th-century buildings, including a Rococo theater, built between 1746-52, and a mosque.
Excellent guided tours are available and are well worth the small additional cost.