Pyongyang Metro, North Korea
The Pyongyang Metro consists of two lines covering quite a huge part of the city.
It is built more than 80 meters below street level and stations can be used as a huge air raid shelter. Although the Metro system has quite some stops only two are open to foreigners, but, as you can see, those two are quite worthwile visiting.
The trains and other technical equipment are russian built and similar to those used in Moscow.