United Kingdom 
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We couldn’t find any streaming options in Australia, but Nazi Megastructures - Season 1 is available in the United Kingdom and 12 other countries on Disney Plus, National Geographic, and 2 other services.
From PBS - In the quest for world domination, the Nazis built some of the biggest and deadliest pieces of military hardware and malevolent technology in history. With brilliant, dark minds and a legion of slave labor at their disposal, the Nazis believed the path to ultimate victory was to out-build and out-engineer their enemies. To them, bigger definitely meant better, and better meant more lethal. As Hitler's grip on Europe tightened, he ordered men like Wernher von Braun, Ferdinand Porsche and Alfried Krupp to build increasingly outlandish machines and structures to realize his master plan. Creating huge terror machines, hi-tech superguns and some of the original weapons of mass destruction to control a nation, conquer a continent and win the war. This is World War II told from a new perspective. The series uncovers the engineering secrets of six iconic mega-structures, tells the stories of the evil geniuses that designed them and reveals how these structures sparked a technological revolution that changed warfare forever.
