In this episode of The Unknown Files, we journey into the depths of history to uncover the mysteries of lost civilizations. From the enigmatic ruins of Atlantis to the advanced yet vanished Indus Valley, we delve into the stories and legends of societies that thrived and disappeared without a trace. Join us as we explore the fascinating theories surrounding their downfall, the secrets they left behind, and the possibility of their existence shaping the modern world. Prepare to be captivated by the echoes of the ancients, as we piece together the puzzle of humanity's forgotten past.