This photograph was made inside the abandoned Grease Factory in Huntley, Illinois. There were a few of these large machines in the facotry; I'm not sure what they do, but they're damn impressive looking. I used my Mamiya C330 and a 55mm lens on Kodak TMax 400 film. The physical print is 10 x 10 inches. Thanks for looking!
Edit: This is a boiler, and I am an idiot. Thanks Jeremy.