Gold of the Gods by Erich Van Daniken

This was Van Daniken's third book (1972) and much more readable than his previous two. For those unfamiliar with him, Erich Van Daniken proposed in Chariots of the Gods? that man was visited in the past by ancient astronauts and that civilization is the result of a breeding program by them. Much of it is written in first person about his travels, and this makes it more enjoyable. There is much more photographic evidence than in his previous books. Also less about genetics and more about the "gods" and what they left behind. While his theories are plausible, he often makes huge leaps of logic to back them up. He also is not very patient with those who disagree with him, although I don't think he is as intolerant as Whitley Strieber. Whether you agree with him or not, this is a fun read.