The river Orbe created the Fairy Caves at the Vaudoise town of Vallorbe. The caves constitute a fascinating grotto complex. The round trip tour leads visitors along the subterranean course of the river to stalactites, stalagmites, dripstone structures, columns and to galleries.
The Vaudoise town of Vallorbe lies in a valley basin of the river Orbe, directly on the French border. An inconspicuous chalet is nestled against the slope above Vallorbe. It is the disguised entrance to the fortress "Pré-Giroud".