Take a good look at this towering iron monolith. Is it from the base of the Eiffel Tower? The scaffolding of a New York City skyscraper? It’s actually part of the Aerial Lift Bridge in Duluth, Minnesota. The city is one of the most important shipping ports on the Great Lakes, linked all the way back to the Atlantic Ocean by a series of locks and waterways. Today’s photo by Flickr user mlmartense, shows us the scaffolding of this massive bridge, which allows giant container ships to pass through below. I particularly like the perspective and angle of the shot, which transforms the structure into a kind of Great Pyramid of hulking iron.