The lower door is where the rocket exhaust would flow into the blast pit during initial launch. The upper doors would vent the rocket so the erector and other equipment in the building would not be (as) damaged.
On the top floor of the former casket building is the finishing line for the coating section; on this section the final spray of plastic would hit the wood before a small furnace would seal the plastic permanently to the surface, making it more resilient, I assume.
The taller of the two smokestacks on site. Note the crack around its crown.
After demolition in the mid 2000s, this interior door became exterior. I remember walking through the car shed as a teenager. It was a shortcut, if I didn’t get caught.
The blast pit carried the smoke and flame from the rocket motor away from the other base buildings.
Like many mill-style buildings of the time, the Twohy’s loading doors (in this case, the delivery wagon doors) opened to an elevator shaft. This design cut down on loading time, as long as the elevator was operational. Of course, if it was otherwise occupied, there could be no traffic through the exterior doors!
This heavy door opens directly into the missile vault and was used to load and unload the missile erector.
Just across the North Dakota border, a rusty Milwaukee Road boxcar sits where it was shoved off the mainline. The grain elevator in the background marks the tracks, which is still used by BNSF.
This ruin was once the Toltec Mine, a producing gold and silver claim that operated into the 1940s.