Eric Geller travels through the dark and damp recesses of Berlin's secretive soil in search of Adolf Hitler's underground lair.
Don Wildman investigates the enigmatic influence of the Freemasons. From hidden tunnels in Boston to an incredible water world under Philadelphia, Don delves into a part of America's past that can only be revealed in the underworld.
Don Wildman goes underground in Romania to uncover the truth about Vlad the Impaler. From the secret prisons where Vlad tortured his victims to escape tunnels carved into mountains, Don peels back the layers of time to reveal the real-life inspiration for Dracula.
Eric Geller digs beneath the fancy hotels and modern construction sites of Budapest to reveal a dark world of ancient caves and subterranean seas.
From fortified castles and sacred sanctuaries to dungeons hidden beneath a sandy lunar landscape, Don Wildman explores a subterranean world of defense where entire civilizations hid for thousands of years in Cappadocia, Turkey.
Eric Geller is granted special access to Paris' dark underworld, where both the secrets of the living and the sins of the dead are revealed.
Eric Geller deciphers fact from fiction as he explores the engineering marvel of Edinburgh's seedy underground.
Empires rise from the ashes as Eric Geller peels back the layers of the past to reveal Istanbul's hidden history.
From rappelling into an ancient Greek cavern to uncovering Nero's famous stage underneath a modern apartment, Don Wildman steps back almost 2,000 years to discover the world hidden beneath Mount Vesuvius.
Eric Geller braves New York's massive urban labyrinth where the past, present and future collide.
Don Wildman ventures beneath the refined modern streets of Portland, OR, into a covert world of slave tunnels, fight clubs, gambling dens and an ingenious water system that literally keeps the city from drowning in its own filth.
Eric Geller goes underground to investigate the founding of the Roman Empire and trace modern technology back to the beginning.
Eric Geller discovers the subterranean secrets found below London's most famous landmarks.
Eric Geller walks the ancient city streets beneath Rome to investigate the world left behind, not by emperors, but by the commoners.