Secret History Season 14 Episode release dates & where to watch

1. The Real Noah's Ark

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2. Hitler's Hidden Drug Habit

Hitler's Hidden Drug Habit Documentary discussing Hitler's fraudulent physician, his poor health and possible drug dependency.

3. World War I's Forgotten Heroes

Former Royal Marines commando Arthur Williams embarks on a journey to explore the experiences of nearly two million British soldiers who suffered life-changing injuries and disabilities during the First World War.

4. The Great Wall of China: The Hidden Story Finale

With access to the first nationwide survey and state-of-the-art drones mapping the Great Wall of China, this documentary offers new evidence that reveals its extraordinary magnitude, rewrites its millennia-long history and decodes its complex signals system. Using cutting-edge chemistry, the programme also finds out what has kept the wall standing for so long - a simple cooking ingredient found in kitchens across the world.