A serene institution in the American Midwest, seized in righteous anger, a subterranean lair in France designed with a disturbing objective, a Spanish settlement concealing a story of forbidden love and ruthless retribution.

In New Jersey, a symbol of American pride and dominance; a top-secret site in Japan used for wartime missions of no return, an Italian town, whose residents were given lethal advice by government officials.

A compound in Seattle linked to a high-profile military scandal, a concrete shell in London that fell victim to the city’s largest explosion, a Wisconsin farmstead known for its brewing history, and a hilltop stronghold in Greece that faced the wrath of a sultan.

Revisit an isolated Peruvian prison where a notorious riot took place and see a revolutionary sanctuary in a Las Vegas park. Learn how a Paris monument became a labor nightmare, then investigate a Sicilian paradise lost in the wake of a disaster.

Unearth a wartime nerve center in Dover that made the UK proud, then visit a mansion caught in the crosshairs of the Civil War. Dig up an Estonian ruin's connection to Catherine the Great and explore the arena where Joe Louis boxed his way to fame.

An investigation centres on a New Jersey racetrack run by a notorious gang, a destructive legacy on a remote Japanese island, a Soviet bunker for a Lithuanian takeover and the pivotal facility that launched Motown's top artists.

Nazi towers in Berlin, defended to the bitter end by child soldiers; a Chicago institution, once the largest of its kind in the world; an eccentric vision in the Malaysian jungle; and a complex in San Francisco, born from the ashes of tragedy.

An iconic Philadelphia venue that set the stage for era-defining artists; a French compound, where a staggering deception was launched; and a Malaysian mansion, the scene of a baffling crime.

In Michigan, a top-secret military base embroiled in an unexplained disappearance; an Italian wonderland, shattered by links to the Mafia; a California transportation hub that inspired lasting change; and a Croatian complex drawn into a brutal conflict.

Inspect a Scottish site that became a military flashpoint; an Oklahoma ruin where Native American cultural genocide took place; look inside a crumbling Greek house of horrors and an Oregon military facility that once battled an imaginary enemy.

Look at a New Jersey complex that once housed a military lab targeted by Soviet spies; examine a scarred Welsh coastline exploited for building materials; trek to a Greek WWII disaster site and a Peruvian palace with a dark secret.

A London tunnel complex from World War II and a New Jersey aviation disaster site are explored; the tour includes a former English industrial center and an Italian forest with unmarked graves.