Cities Of The Underworld

For billions of people across the globe, Jerusalem is considered ground zero for Armageddon.

Be careful where you walk--history's afoot! See a Vietnam that you've never seen before.

Tokyo, Japan is a city straight out of the future, above ground.

Dublin, Ireland is much more than a city full of pubs and pints.

Prague is a city cloaked in mystery, with an underground to match. Medieval castles line the streets and hide dark dungeons deep below them.

Belize was the nerve center of the ancient Mayan civilization. Hundreds of ruins dot the landscape and reveal clues to bloody rituals.

Chicago was once a playground for mobsters and corrupt politicians. It wouldn't be the third largest city in the U.S. today if it weren't for the shady dealings.

The ancient world was shaped by people who believed they foresaw the will of God. Jerusalem is at the heart of all their fiery prophecies. From the outcome of bloody wars to the birth of saviors.

Today, New York is the biggest city in the country... but it's got some dark secrets in its past. It was founded by covert groups, overrun with gangs and mob bosses.

Washington D.C. is headquarters for one of the most powerful governments in the world. Decisions that reverberate around the world are made here.

Moscow is a city known for its ruthless leaders and abundant secrets. Today it's a modern metropolis.

Inflicting over $80 billion in damage, and causing the deaths of over 1,800 people, Hurricane Katrina was among the greatest engineering disasters in US history.

Deep within the former Soviet Union lays a classified, subterranean world of Cold War secrets.