Rome's Colosseum is the most famous stadium on the planet, and it took cutting-edge engineering and a fallen emperor to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be just as difficult.

Rome's aqueducts are one of the greatest engineering marvels in history, and it took dangerous, cutting-edge construction to build them. Experts use the latest tech and modern-day science to reveal if building them a second time would be as deadly.