Heidelberg is a city in Germany on the Neckar River. Located in a picturesque setting, Heidelberg is a popular tourist center. It is also known for its manufacturing.  On the summit of Jettenbühl (195 m/640 ft), which dominates the eastern portion of the city, is Heidelberg Castle (mainly 14th-17th century), one of the most impressive historic landmarks of Germany. The structure, now largely in ruins, preserves numerous examples of medieval, Renaissance, and baroque German architecture.