Journey beneath the streets of Istanbul and discover the hidden world left by the Romans, Byzantines and Ottomans.

Travel beneath the streets of Edinburgh and discover what has been forgotten, including the remains of body snatchers and outlaw distilleries.

Go beneath the streets of Berlin and unearth the remains of the Nazi bunkers.

See what lies beneath the city that was the heart of the Roman Empire.

Discover the secrets that lie beneath Paris.

Explore the caves beneath the city of Budapest, Hungary.

Explore beneath New York City, a living, breathing complex of engineering, history and secrets that could only exist in America's largest city.

For thousands of years London has been among the most powerful cities in the world, below the busy streets and marketplaces another city hides--a city of Roman baths, secret crypts, lost rivers and indestructible bunkers that could hold up to 8,000 people.

Naples, Italy narrowly escaped meeting the same fate as its neighboring city, Pompeii in 79 AD when Mount Vesuvius wiped out everything around it. The wind saved Naples that day, but life in the shadow of this massive volcano is unlike any other--and so is its underground.

Discover the fascinating and unknown history that lies below major cities around the world today. Explore these layers, which are often hundreds of feet deep. Discover everything form dank dungeons to underground shipwrecks that have been lost for centuries.

Visit the city of Bucharest, Romania and learn about its most famous citizen, Vlad the Impaler, more commonly known as Dracula. Travel underground as secret prisons, caves and dungeons are revealed. Only through the bleak subterranean stretches can one come face-to-face with the truth about this infamous Romanian ruler.

4000 years ago, a mysterious pagan society called the Hittites dug deep into the soft volcanic rock to carve out an intricate underworld. But after almost 800 years of rule, the Hittite Empire vanished without a trace. Where did their people go and what clues have they left behind in their complex subterranean world?

100 years ago Portland, Oregon was a city full of vice, considered the most dangerous port in the world. It was a place where you could get drugs or booze or wake up trapped in a cell beneath the earth.

What was the secret to the success of ancient Rome? Aqueducts, underground neighborhoods and one of the oldest sewer systems reveal many secrets. The largest and most influential empire in history leaves clues to her greatness under nearly every street.