You Won't Believe This Underground City Still Exists!!

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It would seem in this modern day and age that us humans like to build things that reach to the sky. However, it goes without saying that humans have probably lived in underground places and caves since ancient times escaping harsh weather and other things such as invading armies, building downward deep intricate tunnels, waterways, and entire underground cities that will amaze you. From ancient underground cities, nuclear bunkers, and modern marvels of construction check out these most insane underground cities in the world. 

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