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Doom II
Paintings of Adolf Hitler could be found in a portion of hell built by evil humans.
The Doom Marine found a secret level. That looked to be built by humans, rather than demons. He wondered who the inmates of that corner of hell would actually be. Inside he dissovered Wolfenstein SS.
Doom novels
The demons from the River Styx had appropriated the crooked cross" that a certain Austrian corporal had appropriated in the middle of last century.
Behind the scenes
A possible reference to the Wolfenstein and Doom Wolfenstein levels appears in the Knee Deep in the Dead novel. When Flynn and Arlene discuss possiblity of encountering giant vampire slugs from the planet Pornos, or being machine- gunned to death by Nazi schutzstaffel.