I have said that the unbroken monotony of the rolling plain was a source of vague horror to me; but I think my horror was greater when I gained the summit of the mound and looked down the other side into an immeasurable pit or canyon, whose black recesses the moon had not yet soared high enough to illumine. I felt myself on the edge of the world; peering over the rim into a fathomless chaos of eternal night. Through my terror ran curious reminiscences of Paradise Lost, and of Satan's hideous climb through the unfashioned realms of darkness.