The movie industry is full of artists and builders dedicated to very specific things: period costumes, architecture, props, urban design, you name it. Hollywood is full of them. They have to do *lots* of research.
They also look for locations that happen to already look like what they’re looking for. For example, a lot of movies that take place in pre-WW2 France were actually shot in places like Czechoslovakia, because they weren’t bombed to shit and rebuilt with modern buildings like Paris was and the architecture was similar. (Also it was cheaper).
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