Growing up I was always amazed at how humans have been able to build such great structures such as the Pyramids, The Great Wall of China and the Hoover Dam. You look at them and wonder how in the hell did they build that thing. Well there is a YouTube channel for all that, The Engineering Channel has everything from military construction projects to the largest machines in the world. If your into expanding your knowledge of engineering then be prepared to have your mind blown. Living so close to one of these structures, the George Washington Bridge, I was always have been interested in it’s history and well they got a whole video about this beast. Check it out and be sure to subscribe.