Red volcanic rocks and houses in the cliffs of the caldera of Therasia (Santorini) Lichen on stones (Santorini) Flagrant oleander tree Pumice wall (deposits from the 1645 BC eruption of the Santorini volcano) Ash deposit (1645 BC Minoan eruption) Coffee break with view onto the caldera Viewpoint near Oia town (Santorini) Oia town in the afternoon light (Santorini)