Peter Matthiessen's report of his expedition crisscrossing 10,000 miles of the South American wilderness, from the Amazon rain forests to Machu Picchu, high in the Andes, down to Tierra del Fuego and back. He followed the trails of old explorers, encountered river bandits, wild tribesmen, and the evidence of ancient ruins, and discovered fossils in the depths of the Peruvian jungle.