E1 • Beneath Vesuvius: Naples

Naples is a time capsule of ancient life, with banks, bakeries and even Nero's famous stage hidden under the streets and in the caverns of Vesuvius.

43m • 2007

Naples is a time capsule of ancient life, with banks, bakeries and even Nero's famous stage hidden under the streets and in the caverns of Vesuvius.

E2 • Catacombs of Death: Paris

An alternative world thrives in the shadows of this capital 'city of lights'. Host Eric Geller has special access to this dark underworld, where both the secrets of the living and the sins of the dead are revealed.

43m • 2007

An alternative world thrives in the shadows of this capital 'city of lights'. Host Eric Geller has special access to this dark underworld, where both the secrets of the living and the sins of the dead are revealed.

E3 • City of Caves: Budapest

Budapest sits on top of an ancient secret. Follow Eric Geller as he uncovers a top secret WWII hospital and finds the source of the boiling healing water used by the Romans and the Turks in the caves beneath Budapest.

43m • 2007

Budapest sits on top of an ancient secret. Follow Eric Geller as he uncovers a top secret WWII hospital and finds the source of the boiling healing water used by the Romans and the Turks in the caves beneath Budapest.

E4 • Dracula's Underground: Bucharest

From secret prisons to escape tunnels, ancient caves to mines, Bucharest in Romania is ripe with folklore. Discover the history of its secret underworld.

43m • 2007

From secret prisons to escape tunnels, ancient caves to mines, Bucharest in Romania is ripe with folklore. Discover the history of its secret underworld.

E5 • Freemason's Underground: Boston & Philadelphia

From hidden tunnels beneath Boston to the incredible waterworld under Philadelphia, the Freemasons left behind the blueprints to America's rise.

43m • 2007

From hidden tunnels beneath Boston to the incredible waterworld under Philadelphia, the Freemasons left behind the blueprints to America's rise.

E6 • Hitler's Underground Lair: Berlin

Host Eric Geller travels through the dark and damp recesses of Berlin's secret bunkers. Engineered by the Nazis during WWII, their dark past is revealed.

44m • 2007

Host Eric Geller travels through the dark and damp recesses of Berlin's secret bunkers. Engineered by the Nazis during WWII, their dark past is revealed.

E7 • London's Lost Cities

From Roman baths, secret crypts, lost rivers and even Winston Churchill's hidden war rooms, London's underground world has a plethora of stories to tell.

42m • 2007

From Roman baths, secret crypts, lost rivers and even Winston Churchill's hidden war rooms, London's underground world has a plethora of stories to tell.

E8 • New York

What's at the heart of the Big Apple? Explore a tangle of engineering, history and secrets that make up a dark urban underworld labyrinth. It's the city that never sleeps!

43m • 2007

What's at the heart of the Big Apple? Explore a tangle of engineering, history and secrets that make up a dark urban underworld labyrinth. It's the city that never sleeps!

E9 • Rome's Hidden Empire

Host Eric Geller discovers what life was like during Emperor Nero's tyrannical reign and Augustus's reforms by peeling back the hidden history of Rome.

43m • 2007

Host Eric Geller discovers what life was like during Emperor Nero's tyrannical reign and Augustus's reforms by peeling back the hidden history of Rome.

E10 • Rome: The Rise

Beneath the modern city streets, ancient underground neighbourhoods and sewerage systems reveal the technological marvels that helped advance an empire.

43m • 2007

Beneath the modern city streets, ancient underground neighbourhoods and sewerage systems reveal the technological marvels that helped advance an empire.

E11 • Scotland's Sin City

From plague victims being buried alive to body snatchers, illegal distilleries and castle dungeons, Edinburgh's underground world has a myriad of stories to tell.

42m • 2007

From plague victims being buried alive to body snatchers, illegal distilleries and castle dungeons, Edinburgh's underground world has a myriad of stories to tell.

E12 • Secret Pagan Underground: Cappadocia

The castles and dungeons of the Hittites are hidden beneath the sandy lunar landscape of Cappadocia. Why did this ancient empire fall?

43m • 2007

The castles and dungeons of the Hittites are hidden beneath the sandy lunar landscape of Cappadocia. Why did this ancient empire fall?

E13 • Underground Bootleggers: Portland

Slave tunnels, gambling dens and opium runners: welcome to the dark, 100 year-old underworld history of Portland, Oregon, famous for being a city full of vice.

43m • 2007

Slave tunnels, gambling dens and opium runners: welcome to the dark, 100 year-old underworld history of Portland, Oregon, famous for being a city full of vice.