Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
Himmler's Occult Castle: In 1933, Heinrich Himmler signed a 100-year lease for Wewelsburg castle in Buren, Germany. The space became a clandestine training space for the SS.
Allied forces stumble across a sprawling complex in the French countryside. What did the Nazis have planned for this mysterious Nazi stronghold?
A chilling discovery in the furthest reaches of Eastern Canada hints at the true depths of the Nazis' seafaring capabilities.
Scientists in Kamienna Gora work to keep the Luftwaffe flying but are they also building Hitler's next revenge weapon?