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."

New archaeological expeditions are unearthing long-lost evidence behind the legend of King Arthur, and using this cutting-edge tech, experts might finally be able to separate fact from fiction. This is a mashup of S02E06 "Hunt for King Arthur's Castle" (Stirling Castle in Scotland) and S06E12 "Rome's Great Wall" (Hadrian's Wall).