(GMT)24 JUN 2017 RO4SIL:
The Philosopher's Walk is located on the northern side of the Neckar River in Heidelberg. If you walk up from the old bridge it is a steep climb but if you approach it from the other bridge downstream then it is more of a steady climb.
Philosopher's walk is best done from the Western side of the town, going up near the Physics building to reach the belvedere. It is a great way to first see Heidelberg from the traditional postcard view. You can see the Old bridge over the Neckar and the Schloss in the background. After walking along the high Weg, you can walk down the narrow steep steps to the old bridge, and cross the river into the Altstadt.