3-castle circuit: Aubas (hiking circuit) "Discovering the treasures of hte Vézère Valley" Through this circuit you'll discover the variety of landscapes that reflect the characteristics of the region. From the verdant Vézère Valley, you'll climb up through woodlands with views over Aubas. Then you'll arrive on a plateau similar to the "causses" (Mediterranean type vegetation) and then discover the three castles that fan out in the valley. This circuit can be done in segments.