My first night on Minneapolis’ Lighthouse–now an old picture and distant memory… I still remember the exhilaration and the view of the city off one edge of the roof and the Mississippi River over the other.
The east side of the boiler shop sported a platform with a control booth and heavy machine mounts. Note the door that replaces the lower section of stairs for explorers.
This might have been part of the Pioneer Pellet Plant. It looks to be a ball mill, which pulverizes ore by spinning it with thousands of ball bearings.
Without a roof, the bricks were being washed away in the later years of the roundhouse.
I did not take the escape ladder to the surface, but I am told it pops up in the middle of a hill next to the missile silo doors.
The bricks routinely fell from the walls, like seeds falling from trees. On a smaller scale, new walls grew from the floors.