Around the world, archaeologists are uncovering artifacts that suggest the existence of previously unknown ancient civilizations, much like the mythical city of Atlantis. There is a growing belief among certain scientists and archeologists that tens of thousands of years ago, before the rise of today's man, sophisticated human societies populated large cities that possibly featured mechanized transportation, electricity, and advanced weapons systems. Proponents of this theory believe that these civilizations were wiped off the planet and that the evidence now lies buried miles beneath the Earth's surface. This two-hour special will investigate these beliefs and uncover the truth about people who lived before the beginning of recorded time.Around the world, archaeologists are uncovering artifacts that suggest the existence of previously unknown ancient civilizations, much like the mythical city of Atlantis. There is a growing belief among certain scientists and archeologists that tens of thousands of years ago, before the rise of today's man, sophisticated human societies populated large cities that possibly featured mechanized transportation, electricity, and advanced weapons systems. Proponents of this theory believe that these civilizations were wiped off the planet and that the evidence now lies buried miles beneath the Earth's surface. This two-hour special will investigate these beliefs and uncover the truth about people who lived before the beginning of recorded time.