What if I told you there were secret cities located in the world, their names and locations kept hidden by the government?
A closed city is a settlement with travel and residency restrictions. These cities don't show up on any maps, there are no road signs and bus routes only run to nearby villages.
Russia has got 44 acknowledged closed cities, with 15 more believed to exist, but nobody knows their locations or names apart from the Russian government.
These cities were established from the 1940's onwards. They were home to small communities with sensitive military, industrial and scientific facilities.
These cities were often situated on borders and close to rivers and lakes to provide large amounts of water needed for heavy industry and nuclear technology.
A closed city would often be guarded by barbed wire and prisons, although the residents could easily move in and out via the checkpoint. The existence of the city was often classified and residents were expected to uphold the secrecy of their residence.
Even after over 20 years since the end of the Soviet Union, Russia still officially keeps a number of its closed cities in the former Soviet republics.