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).

Cutting-edge archaeological technology is revealing new secrets behind America's greatest heroes and most infamous villains; the fresh evidence uncovered at hi-tech investigations could change everything we know about these American icons. This is a mashup of S06E08 "Ghosts of the Wild West" (Tombstone's OK Corral) and S06E11 "Alcatraz's Hidden Secrets."