Edinburgh, Scotland is a thriving metropolis, but take a look into its past and you'll find a double life: a sophisticated surface city evolving above while a darker, seedier world grew below.
Berlin, Germany was the battlefield of the 20th century, and today, sealed up and forgotten beneath its streets, are the remnants of a dark past.
Rome is a city where the past meets the present on every corner. Join host Eric Geller as he reveals the technological marvels that allowed the construction of one city upon another - literally.
From its Gallic beginnings to the Roman foundations of Lutetia, today's Paris may be one of the world's most sophisticated cities above the ground--but below ground it's a different story.
The caves beneath Budapest were formed during the Ice Age, and everyone from the cavemen to the communists has moved their city into the depths of this parallel world.
From a classified World War II site to the rivers and aqueducts that led to this great city's ascent, New York City may just have more stories below ground than it does above.
Join host Eric Geller as he reveals the subterranean secrets found below London's most famous landmarks and even finds Winston Churchill's hidden war rooms.
The wind saved Naples from the fate of its neighbor city Pompeii in 79 AD, but life in the shadow of a massive volcano is unlike any other - and so is its underground.
From hidden tunnels beneath Boston's North End to the incredible water world still intact under Philadelphia, the secret society of Freemasons has left behind the blueprints to America's rise.
Travel underneath Bucharest, Romania to separate the myth of Dracula from reality of Vlad the Impaler as secret prisons, caves, and dungeons are revealed.
The landscape of Cappadocia in modern-day Turkey is unlike any other in the world, with an underground to match. Explore the subterranean world where entire civilizations hid for thousands of years.
100 years ago, Portland, Oregon was considered the most dangerous port in the world. Join host Don Wildman as he ventures beneath modern Portland into a nefarious world of fight clubs, slave tunnels, and gambling dens.