In Underworld: The Mysterious Origins of Civilization, Hancock raises an excellent point — sea levels in ancient times were mush lower than they are now. Thus, many ruins may lie under the water a theme which he fully explores in this novel. The novel is a bit lengthy.

Graham Hancock does not disappoint in Heaven’s Mirror, a book about lost civilizations.  Containing hundred of beautiful images and graphs, the reader will be convinced that perhaps there do exist civilizations that have vanished from the history books. In addition, Hancock does a great job in this book, and in his other books, at describing the astronomical phenomena of precession. Here is brief video of Hancock talking about the book.

There exists a theory, called the Orion Correlation Theory, which claims that the Egyptians built the pyramids to mimic the asterism of Orion’s Belt. Thus, the Nile River would correspond to the Milky Way. This theory was first publish in a book, The Orion Mystery: Unlocking the Secrets of the Pyramids, by Robert Bauval and Adrian Gilbert. This work provides a new perspective on the importance of astronomy to the ancient Egyptians. Anyone who loves ancient mysteries should give this book a read.