Inca Footprints: I wrote this book as the result of not finding anything similar to it in Cusco, or anywhere. Cusco and the Sacred Valley are full of ancient megalithic stone remains and structures, many of which are far older than the Inca, and this fact is not explained, and in fact not known by many of the guides and tour companies there. This book is the result of 5 years of on the ground research by me, Brien Foerster, and contains so many photos, that the book acts as a virtual tour of the whole area.