A disintegrating tower once a thriving cultural hub now stands hollow and derelict in Monrovia, Liberia; experts investigate and uncover a landmark skyscraper left to decay in the wake of a bloody political coup.

Conspiracies swirl around an abandoned military base in Long Island, where it's alleged that covert government experiments took place underground.

In Panama, a military base stands on the frontlines against a tyrant.

A New Jersey jail is overwhelmed by a wave of anger, a Polish stronghold becomes a tool for WW1 propaganda and an English country retreat provides safe harbor for fugitives.

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 town in Oklahoma is transformed by the discovery of oil fields and a former school in Cambodia becomes the site of crimes against humanity.

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 ghost town in Sicily has deep roots in organized crime and an obscure asylum in Pennsylvania shocks America and inspires a revolution.

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.

Experts uncover a derelict resort complex constructed by the Russian mafia.

New discoveries reveal how an unfinished Nazi fortress was built.

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.

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 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.

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.

Experts examine a military cover-up with extraterrestrial objectives.

The ruins of an abandoned prison are evidence of a chaotic riot that put the prisoners in charge; special access to its burnt-out interior reveal how inmates took over Ireland's Alcatraz and why it is deserted today.

Experts investigate the ruins of a spy’s former battlefield.

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

A breathtaking stainless steel tower seems otherworldly and out of place in the remote mountain forests of Croatia; experts investigate and uncover a dark past of Nazi-led conflict and a monument to a desperate fight for survival.

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

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.

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.

A strange bunker in a treacherous landscape once belonged a notorious dictator who's paranoid fantasies drove bizarre and elaborate feats of engineering; new discoveries reveal the secrets of these structures and why the nightmares that built them.

Experts investigate the deadly legacy of an abandoned sea fort.