The Seven Wonders of the Ancient World are the engineering marvels built by great minds of long-lost civilizations, but we're not sure if some even existed; new discoveries and cutting-edge archaeological methods might prove what they looked like and why they disappeared.

Egypt's first pyramids set the groundwork for the kingdom's future engineering marvels, and using cutting-edge tech, experts travel back in time to investigate the mystery of why the Egyptians began building these strange structures. This is a mashup of S04E02 "Mystery of the Cursed Pyramid" (Bent Pyramid) and S06E10 "Hunt for the First Pyramid" (Step Pyramid at Saqqara).