Explore the advanced technology developed by ancient civilizations and travel back in time to understand what motivated these early inventions. From pagodas to aqueducts, learn how these structures came to life.

History's most brilliant mind was also its most dangerous. With 300 inventions, Tesla's mind still dominates our world. While he was making millions, he also made enemies. His research was lost after a mysterious death. Recently declassified documents may help solve the mystery.

For thousands of years, alternative truths have been hiding in plain sight, locked away with secret codes and symbols whose meanings were known only to the initiated until now.

Forbidden History tells true stories about great treasures, long-held conspiracies theories, ancient relics and lost civilizations. It gets to the very heart of what we think we know; it scrutinizes and considers, investigates and analyses.

Watch as spectacular CGI animation sheds major cities of steel, concrete, air, ocean and bedrock - layer by layer, act by act - in an investigation of each city's hidden infrastructure.