DESCRIPTION Did you know? In the quest for world domination, the Nazis built some of the biggest and deadliest pieces of military hardware and malevolent technology in history? Creating huge terror machines, hi-tech superguns and some of the original weapons of mass destruction, their aim was to control a nation, conquer a continent and win the war! Over six unforgettable episodes, Nazi Megastructures uncovers the hidden remains of Hitler’s most ambitious Megastructures, telling the stories of the engineering geniuses that designed them and revealing how these structures sparked a technological revolution that changed warfare forever. EPISODE GUIDE Nazi Megastructures: The Atlantic Wall Discover the story behind the defensive wall, stretching thousands of kilometres, built by the Third Reich to protect themselves from the Allies. Nazi Megastructures: U-Boat Base To create a safe haven in port for their lethal U-boat submarines, the Nazis built massive, impenetrable submarine pens that still survive today. Nazi Megastructures: V2 Rocket Bases Discover how Nazi scientist Wernher von Braun heralded the birth of ballistic missiles and laid the technological foundations for the space race. Nazi Megastructures: Super Tanks The story of Nazi engineers tasked with fulfilling Hitler's megalomaniac demand for the construction of a land battleship weighing 1,000 tons. Nazi Megastructures: Hitler's Jet Caves Explore the story behind one of the most advanced aeroplanes of WWII, the Messerschmitt Me 262, and the subterranean bat-cave where it was built. Nazi Megastructures: Fortress Berlin April 1945. Safe in his heavily fortified FŸhrerbunker in the centre of Berlin, Hitler prepares for the Allies' final attack.
这个全新的节目将揭开从玛雅到特奥蒂瓦坎的拉丁美洲文明里那些不为人知的故事。国家地理将借助尖端技术，在最令人惊叹和最具标志性的考古遗址中揭开深层次的谜团，呈现最具争议的考古发现。国家地理探险家安德烈斯鲁佐和考古学家、技术专家法比奥·阿马多将是我们的探险向导。有了第一手的信息渠道，再加上虚拟现实作品、360度视频资料、无人机拍摄和难以置信的照片细节，我们的科学家将能够揭示古代的奥秘，同时分享探寻这些地点的奇妙经历。
随着冬季的缩短和哈德逊湾冰层的消退，一只北极熊妈妈和它的两只幼崽努力克服气候变化带来的诸多困难。北极熊向导丹尼斯·康拜瑞跟随这个家庭，见证这一难以置信的生存和适应的壮举。 第1期 北方家族（Clan of The North） 第2期 幼崽们的旅程（The Cub's Journey）
From a nuclear lake to a haunted forest, New Zealand filmmaker and journalist David Farrier ('Tickled') visits unusual -- and often macabre -- tourism spots around the world.
一名男孩遭到残忍谋杀，而他的监护人和社工的公开审判，让人不禁质疑现有体制是否能保护弱势儿童
