The Nasca lines -- giant ground drawings on the floor of southern Peru's coastal desert -- have been called the 8th Wonder of the World. Vast tracings of birds, animals and plants; a man 100 meters tall, his arm raised beckoning to us; dozens of spirals, zig-zags and triangles, and thousands of mile-long straight lines crisscrossing, these Ôgeoglyphs' have defied explanation. Can they be effigies of ancient animal gods, or patterns of constellations? Are they star pointers, maybe even a map of the world? How did the people who lived here 2,000 years ago manage to construct such precise figures? A team of archaeologists, engineers and surveyors spent 10 years investigating this enigma. Here is the story of their discoveries. 115 B&W and 13 color illustrations.