This is an odd question, I'm interested, were there actually these German facilities, or factories, secret, on some 'remote' locations, mountains and so on. Similar like in some video-games actually. I'm still a beginner researcher, and the German geheim stuff is not my strong side I hope my question is not weird, or not understandable. Pictures, info, all are welcome. Cheers, Alex.
There were a lot of underground factories built all over Europe, some fairly secret, some less so. As a start you could look at this thread; german underground tank factory richards quarry - World War II Forums There are many more If you can manage the German - complete list of all known projects; http://de.wikipedia.org/wiki/Decknamen_nationalsozialistischer_Geheimobjekte
UNDERGROUND NAZI FACTORY UNCOVERED IN CZECHOSLOVAKIA - British Pathe video of one in czechoslovakia... http://www.thirdreichruins.com/thuringen.htm http://www.thirdreichruins.com/mittelwerk.htm here are two, and many other links... http://www.zenza.se/vw/mf051.pdf underground factory...