Charlton Heston presents this documentary offering geological evidence that the world's most famous ancient monument, The Great Sphinx of Egypt, may be thousands of years older than we have been taught. The film also investigates how the massive 200-ton limestone blocks were lifted and stacked five high to build the Sphinx Temple, and explores a newly-discovered square cavity directly beneath one of the paws of the Sphinx, which does not appear to be a natural formation. Could this be the Hall of Records of Atlantis?