Lost civilizations : the secret histories and suppressed technologies of the ancients

"What remains of past inhabitants of the jungles, lost cities, underground and underwater structures and their civilizations? The reminders of the Ancients are everywhere. They are preserved in remnants in archaeology. They are found stories from mythology. They are recorded in books, oral tradition, song, and stone. Who were these people? Aliens, humans, or myths? How did they rise? Why did they fall? Will they rise again? From pyramids and unde...