As you follow the watercourse, you will discover the secrets of hydraulic power and industrial development in Thur Valley – some information panels are dotted along the way and take you back to a time when the Thur was lined with mills: paper mills, flour mills, oil mills etc. The trail leads you to Kruth-Wildenstein Lake, the largest reservoir in the Vosges Mountains, which is a fantastic base for leisure activities in the shadow of the ruins of Schlossberg Castle.