This is in my Top 10 books. Hancock tags a lot of his posts on Facebook with "things keep getting older." He has made a career of challenging the orthodox thinking on the age of civilzation(s). (And the orthodox don't like being challenged).

This book gets into details about recent discoveries such as: ancient maps that indicate the ancients were capable of complex math well beyond out current thinking. He details the similarities and common characteristics of the myths of Osiris in Egypt and Viracocha in South America. He shows the pyramids at Giza form an exact terrestrial diagram of the three belt stars in the constellation of Orion.

Hancock feels that we are missing a big chunk of our history. He shows that Flood stories are shared by more than 500 different cultures and that all of them share the same symbolic motifs: the one good man, a warning from a god, and the seeds of all living things.

He think the Flood happened 15,000 or so years ago. It is a truly fascinating read.