Author, explorer and archaeologist Thomson recounts 20 years spent journeying throughout the Andes of Peru, Bolivia and Ecuador in search of lost Inca cities. Much of his work centered in the cloud forest and steep valleys of Vilcabamba, a region first explored by Hiram Bingham, the discoverer of Machu Picchu. His engaging account, a pleasing mix of discovery, colorful personalities, history and archaeology, draws together his many experiences in the region. No lightweight, Thomson and colleague Gary Ziegler announced their discovery of a major Inca site at Coca Cota in June 2002. With three maps and 45 black-and-white photographs. He includes chapters on Inca roads, Ollantaytambo, Machu Picchu and Cuzco.  (AND36, $16.95)