Mysterious structures in the Chinese desert, abandoned subway stations that look like doorways to a steampunk future that never was, top secret nuclear submarine bases built by Stalin in the heart of mountains, hidden bunkers all over the world, forbidden headquarters for spy and military organizations… take a look at some of the places forbidden to most mortals.
https://gizmodo.com/why-is-china-building-these-gigantic-structures-in-the-5859081
