A heavy steel rail door to help funnel explosions upward, rather than outward.
Between the catwalks of Furnace 6, the molted ore would flow through the chute.
The left cave is the largest of the three, and shows the most evidence of expansion.
Kurth looks toward the city that forgot it.
Heavy industrial looks good in cotton candy pink.
In the quality assurance labs there is a old safe.
The BOMARC launch buildings are spaced on a large concrete pad that looks like a parking lot. Out of view are underground pipes for fueling and cooling the rocket motors.
Before Portland-Huron Cement’s Duluth Plant was (mostly) demolished and (partly) turned into a hotel, the top of its silos gave a cinematic view of elevator row.
One of my favorite signs, informing workers about to descend into the open-top grain bins about basic procedures. This was in ADM-Annex 1 (connected to the cleaning house via skyway), so it will never be seen again, unless the sign lands luckily when the elevator is demolished.