Everyone wants to discover the secret of fabulous wealth. What does it take to join one of the most exclusive clubs on the planet and become a billionaire? What do these guys know that we don't? How do you become crazy rich? Watch and learn as we reveal the inside scoop on six of the richest people in history: Jeff Bezos, J. P. Morgan, John D. Rockefeller, Andrew Carnegie, Jakob Fugger, and William the Conqueror.