Found this one on Facebook. Looks like mini stunt double for the Death Star, but it's actually a cutaway image of a battleship--the Leif Eriksson--from a Perry Rhodan story. (Odd that it's not the sharp-nosed cruiser you usually find images of online.)
Though I'm not 100% confident in my Google-fu, I suspect this what the exterior looks like:
In any case, go ahead and embiggen that top image and you've got yerself a nifty space megadungeon map!