I'm guessing the dirigible docks to the top of the building to let people on/off? All I have are a couple of postcards to go by. And I'm thinking that there was some altering done to them using a mainframe of some kind.
Ok. I'll tell you the truth.
This is another view of an alternate Earth history where Nazis rule Europe in 1950.
The 30-year Great War has ended, and Germany has allied with the Confederate States of America. The CSA hopes to use the German's newly developed atomic bomb against its old enemy to the North, the United States of America. But the USA has an atomic bomb of their own.