industrial s and textures, louvered vents and circular catwalks

abandoned architecture aspect bethlehem blast brown building catwalk catwalks chimney circular column corroded decaying derelict exterior factory flaking furnace horizontal industrial industry ladder louvered manufacturing metal mill old outdoors outside paint patina pattern peeling pennsylvania pipe red rivet rust rusty shapes smokestack stacks stained stairs steel texture textures tube urban vent vents vintage walkway