The Real Life equivalent of Hidden Elf Villages. A very Soviet phenomenon, but one still existing in modern Russia and Kazakhstan, although many cities are now "open". The internal term is "closed administrative-territorial formations" = zakrytye administrativno-territorial'nye obrazovaniia or ZATO in Russian.
Appeared from the late 1940s onwards.
These are entire cities that foreigners cannot enter and Russians need a permit to live in, being subject to movement restrictions. Some were physically surrounded by barbed wire, with armed guards. They were referred to only by a postal-code and did not feature on Soviet maps. They were located in remote areas. These cities were usually there to serve the needs of defense industrial complexes or classified research institutes. Most of them were not large enough to be considered cities proper, more like towns, but they were planned and built as full complexes of urban infrastructure, unlike naturally evolved Russian towns, which resemble overgrown wooden villages with a few apartment blocks thrown in. However, those closed cities that already existed as cities before the Revolution were true cities; none of these remain closed today.
Note that living there was not necessarily bad - it involved (and to a lesser extent, still involves) reasonably good and prestigious if secret work, lots of cool if sometimes dangerous stuff happening, and various privileges such as a temporary exemption of local businesses from taxes in the Nineties.
42 are acknowledged to exist today in Russia, but c.15 more are believed to exist.
Some of them were or are:
- Severomorsk. Administrative base of the Russian Northern Fleet. Still closed.
- Gorky, now open and back as Nizhny Novgorod.
- Tryokhgorny. Still closed.
- Mirny, Arkhangelsk Oblast. Still closed, it is home to the Plesetsk Cosmodrome.
- Verkh-Neyvinsk, aka Sverdlovsk-44. Still closed.
- Snezhinsk, Chelyabinsk Oblast. A nuclear research center.
- Sverdlovsk, now Ekaterinburg. Not a proper closed city, but it was still practically closed to foreigners because of its status as an industrial center. It was not the only such borderline case.
- Mezhgorye, a closed city near Mount Yamantau that hosts some 17,000 residents that work on defence facilities around the mountain. It may be the home of the Dead Hand or Perimeter semi-auto-second-strike nuclear launch system devised by the Russians, but is known to house nuclear labs and nuclear weapons development. Think of it as the Mt. Cheyenne analogue.
- Chelyabinsk, now open, a centre of nuclear weapons development and notorious for a nuclear accident in the 1950's that left significant parts of the area irradiated.
- The accident happened not in the city itself, but at the "Mayak" plant, a huge industrial complex responsible for much of the Soviet nuclear production, in the even more closed city of Ozyorsk, then known as Chelyabinsk-40, some 72 km from the Chelyabinsk proper. As both the plant and the city were classified at the time, the accident became known as Kyshtym disaster, after the closest "open" town.
- Vladivostok, main base of the Pacific Fleet. Now open.
Closed cities in fiction:
- In Devil May Care Julius Gorner attempts to destroy Tryokhgorny, referred to by its postal name Zlatoust-36.
- Possibly non-Russian example: City 17. It is an Eastern European city, but it wasn't the humans that closed it.
- Also from the Half-Life universe, the Black Mesa Research Facility is pretty much an American version of a classic compact, high-tech ZATO (except the above-ground parts of ZATOs tend to be less grungy and industrial and more like normal settlements).
- An episode of Airwolf, "Proof Through The Night", is set in Sverdlovsk.
- In The Sum of All Fears movie, agent Cabbot speaks about the closed city called Arzamas (most probably referring to Arzamas-16, now Sarov).
- The game Gorky 17 (a.k.a Odium) takes place in the eponymous closed city (note the error in transcription, as there should be a dash between the name [Gorky is an actual city] and a number).
- Destroy All Humans 2 had a fictional one vaguely called "Tunguska". It played up all the stereotypes To Eleven.
- The "Ensk" Map in World of Tanks is based on a closed city layout.
- Some are mentioned in the Role-playing game Cold City, wherein the PCs are part of a special task force cleaning up "Twisted Technology" developed by the Nazis during WW2. The Soviets certainly want as much of it for themselves as they can get, and you might be able to guess that this is where all the twisted technology Russian PCs can smuggle away goes.
- A non-Soviet version appears in the Agatha Christie story Destination Unknown, where a multimillionaire creates an isolated research facility where the most brilliant scientists of all nations, creeds and political affiliations can continue their work For Science! (or rather, he provides the scientists with everything they need, doesn't let them leave and then plans to sell their research to the highest bidder).