50 BC: Julius Cesar reigned supreme over Gaul. But this was no simple military conquest.

Rome wanted to spread its greatness, bringing civilization to the defeated barbarians now part of the Empire. Rome's new territory was transformed through huge construction projects, involving aqueducts, roads, baths, amphitheaters, and arenas.

This series explores three cities that today are home to the vestiges of this industrious civilization. Through the use of CGI, archive footage, aerial imagery, and expert testimony, this trilogy unveils the secrets of these wonders of Roman engineering.