When I was 7 or 8 I read one of Erich von Däniken's books and got terribly excited - a couple of years later I realised that it was, of course, complete nonsense. I remember being quite indignant that someone could write a book like that. Quite a useful learning experience actually...

This reads remarkably like something from von Däniken but with any mention of ancient aliens removed... Sacsayhuaman, Cuzco, incredible stonework, tunnel networks, lost civilizations....