S1, E6: You have to climb and follow paths that don't always appear on maps in order to discover one of the best-kept secrets of the dynasties of pharaohs which was long hidden in the sand. Here, Egyptologists believe there was a perfect pyramid which served as a tomb for the pharaoh Djedefre. Djedefre's Pyramid in Abu Rawash remains a key component in understanding the secrets of Egyptian architects.