...s that wind in every conceivable direction. Here and there abrupt, almost perpendicular portions of the ancient beds remain in all imaginable forms, some resembling the ruins of abandoned cities. Towers , spires, cathedrals, obelisks, pyramids, and monuments of various shapes appear on every side, as far as the eye can range. Dr. Hayden, the earliest explorer of this region, said: Not unfrequently...