Series 3

1. The Desert Ghost Fleet

The programme looks at a mysterious group of rusting ships stranded in an arid desert, a monstrous defensive line on the snow-covered peaks of the Italian Alps, a ghostly collection of buildings, and the sunken remains of a unique vessel.

2019-03-26 • 44 min

2. The Underwater Prison

An abandoned prison beneath the water, a tunnel in the heart of a mountain, concrete towers hidden in the woods and a rusting coastal relic.

2019-04-02 • 44 min

3. The Siege Of Sarajevo

Concrete channels hidden in a mountaintop forest, a collapsing bridge, a marooned military base and the upright rusting carcass of ship.

2019-04-09 • 44 min

4. Sabotage in the Mountains

A towering structure with an explosive past, a deserted cityscape, a mysterious top-secret facility and a vast Nazi construction.

2019-04-16 • 44 min

5. Germany's D-Day Fortress

A devastated cliff-top ruin, an extraordinarily tall tower, a concrete structure stranded at sea and a heavy metal monster in a field all feature.

2019-04-23 • 44 min

6. Hitler's Wonder Weapons Bunker

Hidden tunnels that saw a city prosper, a sunken wreck with a remarkable past, a concrete wartime dome and a mysterious Cold War building.

2019-04-30 • 44 min

7. A Ghost Town In Spain

A village ruin, pitted and scarred, a ghostly fleet of ships, a bridge to nowhere hidden in a forest and strange metal structures in a wood.

2019-05-07 • 44 min

8. England's Abandoned Village

An eerie, empty country village which hides a sad secret, a mysterious tower battered by the elements and a disused railway deep beneath the streets of a city.

2019-05-14 • 44 min