1 [caption]: Zeppelin route from Moscow to Berlin... {Map showing red dotted line tracking the zeppelin flight from Moscow to Berlin.}
2 Haken: Ach! Nazi science sneers at having to come up with a new "red line" joke.

Yeah, I sneer at it too.

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2015-08-01 Rerun commentary: The map is a map of Europe in 1924. I thought I originally got it from the excellent Perry-Castañeda Map Library at the University of Texas, but I can't find it there any more. Anyway, this library is a great resource for any maps of the world you might want to find.