Call of Duty Black Ops: Cold War is filled with tons of awesome secrets, Easter Eggs, and references. Here are some of the best.
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Sources:
https://www.reddit.com/r/blackopscoldwar/comments/jgxpc2/took_a_closer_look_at_the_backgrounds_of_the_main/

https://www.youtube.com/watch?v=0qvPiUTbevo

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