Moscow Metro-2, Russia
Phantom trains and secret tunnels are something you would only read about in Harry Potter, unless you’ve heard about the Moscow Metro-2.
The KGB built a secret metro system in case a nuclear catastrophe occurred. The system looks just like the public Moscow metro, except much larger and it’s 600 feet under the ground. There are four lines that connect government buildings like the Federal Security Service headquarters, the Kremlin, the government airport and several other locations of importance.
If you ever see a manhole in Moscow you might look at it a little differently now.
