Indonesian artist Agan Harahap put together some interesting photomanipulations of Superheroes in WWII settings. Superman along with soldiers looting museums, V with surrendering troops, or Spiderman in an urban battle scene. Though they still seem out of place, Agan did and excellent job of creating images that are not noticeably Photoshopped. See them all for yourself at his Deviant Art page. Unfortunately, he did not set up a separate folder for them so you'll have to browse through some of his other work as well.
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