For centuries, humans have had a fascination with secret societies. Some societies that are hundreds of years old - like the Illuminati and the Freemasons - are still relevant today. Or, at least, they are thought to be. But why? After all this time, why do people still care about things like that? Whatever it is, Inside Secret Societies gets to the bottom of it. We're taking the oath to reveal some of the more secretive of the secret societies, as...