Hitler spent over 800 days at the Wolf's Lair, his main headquarters. This bunker had a concrete roof over seven meters thick and a protective layer of gravel, making it nearly resistant to bombs and chemicals and lacked windows, requiring a complex ventilation system for oxygen. To conceal it, tons of soil and plants covered the roof, blending it into the forest.

Explore more of this remarkable historic construction in the latest episodes of World War II: Secrets From Above, Mondays at 8pm, only on National Geographic UK.

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Igniting the explorer in all of us. National Geographic gets you closer to the stories that matter and past the edge of what's possible through groundbreaking storytelling. From the best and brightest scientists, explorers, photographers, and filmmakers, Nat Geo is the world's premium destination for science, exploration, and adventure.

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