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 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

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.

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 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.

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.

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.

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.

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.

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.

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.

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.