An abandoned town in the Nevada desert is the ruins of an American Atlantis, destroyed by catastrophic floods when the Hoover Dam was built; experts investigate the secrets of this eerie ghost town as water levels recede and the city reemerges.

Remains of a grand vision become a symbol of excess in the Turkish capital.

Notorious gunslinger John Dillinger once pulled off a daring escape from this unassuming jail.

An elaborate stadium in Lithuania hosts an unlikely Cold War matchup and an industrial relic in England gets caught in a heated labor dispute.

A secret structure on a sinister mountain, an industrial compound swallowed by a forest, and a mysterious run in a sand dune are strange deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

The world's strangest ghost towns are home to dark secrets, creepy buildings and eerie sights; new discoveries reveal why they were abandoned.

A mysterious town in South Africa is deserted, even though it was once a booming community; experts reveal the cataclysm that caused the people of this once-prosperous town to suddenly leave and never come back.

An abandoned theme park is home to secrets of a forgotten, imaginary world.

Deserted buildings are evidence of a city’s lost industrial past.

At an infamous prison in the Amazon, dangerous criminals faced hard labor, a hostile environment and death by guillotine; today, it's deserted and new discoveries reveal why this hellish compound was built and abandoned.

Eerie ghost ships stranded in an alien desert, sinister ruins known as the Dragon's Teeth, and a ghostly complex with a bloody past are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

An American ghost town in the Amazon jungle, a secret Nazi base, and a deadly concrete fortress 866 miles long are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

This fortress once stood between the Ancient Roman and Persian Empires.

An alien Nazi structure that changed history, a strange Soviet monolith known as the Tower of Death, and a concrete ocean giant are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

A haunted prison with a terrifying past once housed America's most notorious criminals, but today, the fortress stands in ruin, and experts reveal evidence of ghostly secrets hidden in the crumbling jailhouse walls.

A building in Colorado is still marked with bullet holes from a Wild West shootout between union members and state militia.

Experts investigate bunkers that conceal a deadly nuclear secret.

New discoveries reveal how an unfinished Nazi fortress was built.

A cluster of military defensive structures among a quaint holiday village lie deserted on a San Francisco Bay island; experts investigate and uncover a mysterious Civil War outpost that conceals a dark and hellish history...

A place of hope in the Czech Republic quietly perseveres in the age of Nazi tyranny, a Moroccan politician sides with the French and an eco-friendly paradise in the Amazon proves to be unsustainable.

A Polish castle becomes entwined in the hunt for lost Nazi treasure, the heir of an American business tycoon gets caught in a web of controversy and an Irish estate is embroiled in a fight for freedom.

The ruins of a dreamlike Polish palace hide an astonishingly dark history that's shrouded in mystery to this day; experts investigate and uncover an ornate gothic structure that concealed a nightmare of Nazi experimentation.

A war-torn Italian ghost town immortalized by a legendary Hollywood director blurs the lines between fiction and reality; experts investigate and uncover a forgotten landscape of ruins captured in a WWII documentary.

A haunted lighthouse on Lake Michigan, a town where everyone seems to have vanished all at once, and a secret complex of tunnels beneath London are deserted engineering projects.

An entrance to the underworld in the American wild, a haunting Soviet underwater prison, and a strange complex of towers in a forest of ice are deserted engineering projects; new discoveries reveal how they were built and why they were abandoned.

An underground labyrinth can warp the mind and turn friend into foe.

A ghost ship thousands of miles away from where anyone expected, a bridge to nowhere in Florida's Hurricane Alley, and a haunting mountain complex with a bloody secret are deserted engineering projects; new discoveries reveal why they were abandoned.

A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

In the former Soviet Union, this theater and others like it were used to influence the minds of the masses.

A strange Cuban prison, an eerie escape route built for Armageddon, and an underwater marvel that changed history are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

On a desolate island near Greece, abandoned buildings are evidence of a group of people that were forbidden to leave; experts reveal who was forced to stay here and if there was a cover-up to conceal what really happened at this strange place.

On a picturesque island off the coast of Brazil, this penal colony was once the site of a dramatic prisoner uprising.

A one-time fairytale castle is rumored to be haunted; experts investigate the secrets and ghostly stories of this eerie fortress.

A strange deserted city in America's heartland, an eerie gigantic wall deep in snow-capped mountains, and a mysterious top-secret Soviet facility are deserted engineering projects. New discoveries reveal how they were built & why they were abandoned.

An old compound in Texas bears the scars of a violent revolution and a secret facility outside Berlin is used by a dictator to escape justice.

A vast network of subterranean bunkers in the American west was home to the power to destroy nations, but today, this facility is deserted, and new discoveries reveal why this eerie place was built and why it was abandoned.

Tunnels filled with human bones lie beneath the streets of Paris, and this horrifying engineering marvel points to a dark secret; new discoveries reveal why this grisly underground death maze was built and why it was abandoned.

A mysterious American pyramid built out of Cold War paranoia, a haunted prison, and a cluster of structures in the Atlantic are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

An abandoned castle is the site of hundreds of horrific murders perpetrated by the mysterious countess who once lived there, a woman alleged to be one of the most prolific killers in history; new discoveries reveal what really happened here.

A remote site in Arkansas plays a major role in a high-stakes Cold War drama, an ancient ruin in Cambodia is ravaged by one man's cruel deception and a French fort becomes the symbol of a heroic but doomed resistance.

The world's abandoned structures hold new evidence about the lives and deeds of history's greatest heroes and villains, and using the latest discoveries at these mysterious sites, experts count down the ten most significant.

An abandoned industrial complex by Lake Michigan was once a top-secret military compound that protected America from enemy attacks; new discoveries reveal what really happened here and why the government turned its back on this juggernaut.

Desert bunkers in Tunisia block Allied victory in Africa; the pride of one Alabama community is born out of a harsh reality; a Lebanese complex is rocked by a massive explosion; the remains of an elite institution still stand in Greece.

Ruins of an imposing mental health institution lie deserted in Scotland.

A slice of the Miami suburbs stands out for its style and history; a hotel in Lebanon carries the scars of a civil war; a pirate radio station gets a mixed reception.

The bizarre remnants of a housing complex lie mysteriously deserted in an Ohio industrial town; experts investigate and uncover the dark, turbulent past of an oppressive steel company and labor strikes that resulted in deadly riots.

A fantasy land lies in the heart of Alabama, a place of refuge in Ireland becomes a house of horrors, a South Korean city is scarred by a violent crackdown and traces of a brutal industry remain along the arid Namibian coast.

A Nazi concentration camp gets used for a grotesque publicity stunt, Oscar Wilde is imprisoned after a well-publicized trial and a building in Memphis intended to protect becomes a symbol of corruption.

Palatial ruins in Philadelphia symbolize an industrial golden age, a remote outpost in France is thrust to the frontlines of World War II and a palazzo right off the Italian coast becomes a prison for mob bosses.

A massive, alien-like fortress built into a mountainside is the central node to a network of pipelines that race outwards like tentacles; behind-the-scenes access reveals the secrets of why this strange complex was built and why it was abandoned.

An eerie prison with a dark past that became the setting of an iconic Hollywood movie and alien monoliths on a strange and remote island are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

A once majestic theater now lies mysteriously derelict in Cleveland.

The bizarre remains of an Old West mining town lie mysteriously deserted high in the mountains of Maggie Valley, North Carolina; experts investigate and discover an abandoned ghost town theme park that some local residents believe carries a curse.

A forgotten military fortification lies hidden in the Rock of Gibraltar.

The haunting remains of an isolated ghost town high in the Colorado mountains suggest a once booming mining community left in devastation; experts uncover an inhospitable land of shattered dreams where fortune seekers chased the American dream.

Abandoned towers in southern Greece are the ruins of a fearsome warrior civilization descended from the Spartans, and new discoveries reveal the role these towers played during generations of violent blood feuds among the clans that lived here.

A luxurious skyscraper in Bangkok is now an eerily derelict ghost tower.

A majestic estate for the rich and powerful now lies abandoned in the highlands of Argentina; experts investigate and uncover a once struggling hotel that was transformed into a luxurious resort outpost for elite Nazi German sympathizers.

An island of dense jungle is home to an abandoned complex with a dark past of bloodshed and rebellion, and new discoveries at this deserted place reveal why it was built and the gruesome circumstances of its downfall.

The ruins of a historic Scottish castle is now a bewitching wilderness of hidden dangers with deadly booby traps obscured afoot; experts and historians reveal a bygone Second World War military hospital with bizarre ties to an infamous Nazi occupant.

Experts investigate the deadly legacy of an abandoned sea fort.

The remains of rocket testing facility lie in the Florida Everglades.

A facility housing two enormous satellites stands derelict in Georgia.

The remnants of a desolate ghost town are uncovered in Azerbaijan.

A legendary US Naval war vessel now stands as a monument to space exploration in Alameda, California; experts investigate and reveal how a formidable WWII aircraft carrier served a vital roll in historic Apollo spaceflight recovery missions.

An eerie ghost village in west-central France, Oradour-sur-Glane, appears as if it were mysteriously abandoned and destroyed all at once; experts investigate and uncover the remains of a derelict settlement left as a memorial to a murderous WWII Nazi raid.

An enormous concrete box with bizarre circular openings looms on the coast of an island near mainland China; Experts investigate and uncover tunnels leading to an enormous underground complex that nearly triggered a nuclear war.

The ruins of a coastal fortress sit atop a jagged outcrop along the beaches of Wales; experts investigate and uncover a derelict 19th-century British fortification that housed a series of occupants, including an exotic, private zoo.

A stronghold in Panama defends a prized American possession, a mad scientist shares an herbal remedy from his hilltop castle, a ghostly German railroad divides a fractured city and a Bulgarian mountain retreat offers hope to its residents

A desert island contains a marooned structure with a contagious past.

In a California desert, a once glittering Hollywood hotspot gets converted into a top-secret interrogation center for POWs.

A teenage girl in Korea is martyred in prison and becomes a national hero; the facility where she was held stands in remembrance of her bravery and the Korean struggle for independence...

Half-built castles stand as a whimsical reminder of a neighborhood that was supposed to feature thermal baths and panoramic views; the ambitious project came to an abrupt halt when the construction company began to face financial difficulties...

A German house of healing becomes a place of evil and a tin mine out in the jungle becomes the object of colonial interests,.

A strange bunker near the Kennedy Space Center once served a top-secret military function should doomsday ever come to the Sunshine State; experts use declassified intel to reveal the sinister purpose of this forbidding facility and why it was abandoned.

An opulent chateau perched in the middle of a lake now stands dilapidated in the Loire Valley of France; experts investigate and uncover the remains of a festering palace whose owner was labeled a traitor by France's most notorious king.