You stand there in awe, over-powered by their sheer magnificence. No wonder we've been intrigued, totally baffled for more than 4000 years. And of all Egypt's pyramids, the Great Pyramid at Giza is by far the most mysterious. It's so imposing, so perfect you can see why many insist it couldn't possibly be the work of mere mortals. It has to be a creation of the gods, either that, or aliens. But at last it seems this ancient riddle has been solved. There's one man who reckons he's figured it all out. And he's willing to share his amazing discovery with us. To take us to the very heart of the mystery, deep inside the Great Pyramid, where very few have ever been.