One of the most controversial historical theories to emerge in the last 15 years is the so-called "1421 thesis". The theory was originally formulated by the former British submarine commander Gavin Menzies. He contends that during the Ming Dynasty the Admiral Zheng He led an impressive fleet of Chinese junks on an unprecedented journey of discovery. According to Menzies this journey took them to the New World nearly 80 years before Columbus. But is there any proof to support this incredible claim? Tune in and find out how dragon thrones, giraffes masquerading as unicorns, and the Chinese Luke Skywalker all play a role in the story.