After starting his career as an apprentice at Rolls-Royce, the Chase host became fascinated with ancient engineering and began to question whether the pyramids were really built by the Ancient Egyptians 4,500 years ago.
Since then, he's considered other theories, such as the involvement of a super-advanced civilisation that's been lost to history, or even aliens!
'I heard this rumour that the pyramids were built by a race that died out,' explains Bradley. 'I needed to find out the truth!'
Big mysteries
Bradley begins his quest for answers at the Great Pyramid of Giza. There, he teams up with famed Egyptologist Dr Meredi...