I went on a trip called "Secret Epirus". Epirus is the area where Parga is situated. The trip took us among other places to Necromantion, which is thought of as the entrance to Hades where the ancient Greeks practised necromancy. The image shows the valley just below that place. They believed it was the gate to the underworld. The valley is the valley of the river Acheron, seen from the entrance to Necromantion.