South of Munich, where the green foothills of the Bavarian Alps start to rise against the massive granite wall of the Alps, there is a little valley with a river running through it. It is called Mühltal (Mill Valley). The stream is lined with unusual steep hills covered with dense beech forest. The area is especially known for its Celtic remains, including a well preserved Viereckschanze and several hill grave cemeteries. It is remarkably rich with natural wells.