Every city has its secrets - but who could imagine how many linger below ground, sometimes for thousands of years? Secret passageways, combat tunnels, buried palaces, Mafia escape routes and ammunition depots are just a few of the subterranean surprises you'll discover in CITIES OF THE UNDERWORLD: THE COMPLETE SEASON THREE, a fascinating look beneath the surface of some of the world's major cities. Ever wonder how Las Vegas casinos keep their cash safe? Or where Roman gladiators learned to fight? How about what's beneath Egypt's first pyramid or San Francisco's scenic hills? Host Don Wildman returns once again to answer these questions and explore other buried secrets from London to Sicily, Okinawa and Ethiopia. Part history buff, part urban explorer, Don uses state of the art surveillance equipment to help investigate places often known only to archeologists and local residents. Walk in the footsteps of history but be careful - it's dark and dangerous down there!