8. Mezhgorye
This town, located in the Republic of Bashkortostan in Russia is closed to the public. It has been reported that people living in the town supposedly work on highly-classified secret projects around Mount Yamantaw, which has been suspected to be the location of a nuclear program, a repository of Russian treasures, as well as a bunker in case of a war and a huge warehouse of coal – but nobody really knows its true purpose.
7. Metro-2
This secret, underground metro system which parallels the public Moscow Metro, was built by Joseph Stalin and was given the code name D-6. It is supposedly still in operation by the Russian Ministry of Defense. Metro-2 is also rumored to exceed the length of the public Metro and is said to connect the Kremlin with the Federal Security Service headquarters, among other locations of national importance. The Metro administration refuses to confirm or deny its existence to this very day.