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As the Nazis plot the beginning of their empire, Heinrich Himmler transforms the ruins of a German castle into a mysterious Nazi complex.

Secret Nazi Ruins

Curse of Himmler's Castle

From the smallest cell to the solar system, Science HD is an odyssey of scientific facts, investigations and breakthroughs.

Science HD

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A medieval castle-like complex in the remote mountains of Germany contains dark secrets to the Nazi's plan for world domination; experts investigate and uncover a nefarious training facility designed to groom elite Nazi personnel.

Secrets of Vogelsang Castle

When the Nazis took Ksiaz Castle in 1941, it wasn't for the view, and they got to work turning it into a fortress; secret staircases and elevators were built, while underneath, a vast network of tunnels was taking form.

Mystery Beneath the Castle

The skeletal remains of strange structures are clues to a mysterious research installation secretly built by the Nazis in Western Poland; experts investigate and uncover top-secret military fuel development with a catastrophic purpose.

Secret Relics of Nazi Research

A labyrinth of tunnels carved deep in the Polish mountains leads to the largest underground Nazi weapons development complex ever discovered.

Underground Superweapons

As the Nazis embark on their dominate rise to power, a massive construction project secretly begins across Eastern Germany; using the latest tech, experts uncover an elaborate network of underground tunnels and bunkers with frightening ambitions.

Secret Nazi City

Guided missiles, the Wasserfall, and the potentially war-changing V2 were dreamed up and tested in a base in Peenemunde.

Inside the Terror Factory

Experts uncover a mysteriously abandoned underground complex that may have hid something very dark.

Secrets of the Owl Mountains

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Uncovering and examining hidden structures built by the Nazis, from tunnels to towers, artillery sites, resistance nests and communication centers.

S2 E8 | Curse of Himmler's Castle

E8 | Curse of Himmler's Castle

E7 | Secrets of Vogelsang Castle

E6 | Mystery Beneath the Castle

E5 | Secret Relics of Nazi Research

E3 | Underground Superweapons

E2 | Secret Nazi City

E1 | Inside the Terror Factory

Secrets of the Owl Mountains