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We take a fascinating journey into the inner workings of the world's most mammoth machines to explore the state-of-the-art technology and engineering extremes behind their behemoth size. (National Geographic)
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Photo © National Geographic Channel
![Colossal Machines - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/166/052/166052897_02d1aa.jpg)