Lines laid across the plain near the Peruvian site of Nazca have been explained as ancient roads or features of a long-forgotten religious calendar. So why did Erich von Daniken interpret these markings as the contours of a huge galactic spaceport? In his assessment of the uncanny and frequently eerie world of UFO-logy, Gregory L Reece travels deep into a mindset which believes that the gods of mythology were really visitors from the stars. Venturing...