This book is concerned with rediscovering ancient sites through new technology. By means of such technologies as satellite- and land-based remote sensing images, the author examines the history and cultures of 20 civilizations, either lost to us completely or remaining only as ruins or oblique references in literary works. Specially commissioned computer-generated imagery recreates the sites of which there is barely a trace, thus enabling us to visit the people, their possessions and the buildings they inhabited, in civilizations from Angkor Wat in Kampuchea to Mahram Bilqis in the Yemen and Tiwanaku in Bolivia.