And even when dusk sets in, it is worth taking a glance at the skies, as a visit to Burg Rheinhardstein will demonstrate. We will invite you around the historical ruins to observe bats actively hunting at night. On the second day we will concentrate on the beaver, which 100 years after its wipeout has at last found its way back to the High Fens. We will follow the traces it has left behind as the landscape architect of the animal world in Braulauftal and Ihrenbachtal, between the little Eifel towns of St. Vith and Bleialf. A pearl of Eifel nature also awaits you in the Perlenbachtal; in the truest sense of the word! We will take you to the stocks of the fresh water pearl oyster, which is at risk of extinction.