Graham Hancock, author of "Fingerprints of the Gods" and "The Message of the Sphinx," discusses his revolutionary theories about ancient civilizations and lost knowledge from his Chicago hotel room during his American book tour. Hancock presents evidence for advanced prehistoric cultures that possessed sophisticated understanding of astronomy, mathematics, and engineering thousands of years before conventional history suggests. The conversation explores mysterious megalithic structures worldwide and their possible connections to a lost global civilization. Hancock examines geological evidence for catastrophic events that may have destroyed advanced ancient societies, leaving only fragments of their knowledge in surviving monuments and myths. The discussion covers the Sphinx's true age, pyramid construction techniques, and astronomical alignments that suggest prehistoric peoples had detailed knowledge of celestial mechanics. Hancock addresses academic resistance to his theories and the difficulty of challenging established archaeological timelines. The conversation examines ancient maps, mysterious artifacts, and cultural similarities across widely separated civilizations. This fascinating discussion reveals how ancient mysteries continue to challenge our understanding of human history and technological development, suggesting our ancestors possessed far greater knowledge than previously imagined.