I am a Graham Hancock fan, and although this book is long-winded in some places (he takes great pains to explain the ancient archaeological megaliths he researched), I found the book fascinating. It is almost impossible to explain briefly what the book is about, but I'll try. He travels to Indonesia, Peru, Turkey and other places to investigate -- often almost unknown -- megalithic monuments or "buildings". Some are being investigated or researched by scientists, while investigation of places like Göbekli Tepe in Turkey might right now (due to the political situation) have come to a halt. In short, he did exhaustive research to prove that a great civilisation existed more than (roughly) 12,000+ years ago, who left their "fingerprints" -- these monuments -- in parts of the Northern hemisphere. This civilisation and its complete destruction circa 12,000 years ago, has been forgotten, except where it lives on in myths and legends. The destruction came about as the result of enormous shards of a comet which hit the earth sometime between 12,800 - 11,600 years ago. This destruction caused a new Ice Age -- and the humans who slowly over thousands of years emerged and built a new civilisation knew little about what had gone before. Hancock researched his facts very carefully, and mentions many other scientists who came to the same conclusions as he did. Basically he concludes that the megalithic pyramids and monuments he visits are much older than mainstream archaeology would admit or even want to admit. But you have to read this densely-written and well-researched book yourself -- I was flabbergasted at some of the explanations and facts he unearthed. And basically -- coming back to the Mayan calendar and modern astronomical research he concludes that -- give or take anything from the present day to 800 years hence -- the earth will once again cross paths with deadly comets, of which three (asteroids who are waking up like dormant volcanoes) seem to be developing in the asteroid belt, and apparently can be seen through telescopes. We are entering the danger period ... Wow, what a ride this book was! It was a slow read, as I am no archaeologist, but I enjoyed it and could hardly put the book down. I am impressed by the thorough research the author had done.