Peru: Recommended Reading For further study about Peru, Martin Gray recommends the following books and travel guides: The Last Days of the Incas Machu Picchu: Exploring an Ancient Sacred Center The Incas: New Perspectives The Secret of the Incas:Myth, Astronomy, and theWar Against Time Ritual and Pilgrimage in the Ancient Andes: The Islands of the Sun and the Moon The Conquest of the Incas The Inca Trail, Cusco& Machu Picchu A Sacred Landscape:The Search for Ancient Peru Monuments of the Incas Ancient Cuzco:Heartland of the Inca Mail