Quest for the Lost Civilization

I just finished watching Graham Hancock's 1998 three part TV series "Quest for the Lost Civilization." He sets out to prove that ancient civilazations such as the Great pyramids at Giza, Angkor Wat, Stonehenge, Teotihuacan, the Nazca lines, and Easter Island are linked by astronomy to an even older, lost civilization which may be that of one underwater in Yonaguni, Japan. It's quite interesting, I don't think there is enough evidence to support his theory but the idea that these civilizations might all be linked is nice. I hope to visit them all someday. The photos were taken during a trip to Cambodia last year- the first is Angkor Thom and the second is Angkor Wat from a hot air balloon.