It's thought there are about 40 closed cities in Russia, though it's suspected there are others whose very existence is highly classified.
First established in the 1940s, closed cities — officially known by the acronym ZATO in Russian — are most often associated with either military installations or major research centres and are used to house employees and their families. It's been a closed city since 1946, when it was renamed Arzamas-16 and its location was removed from all unclassified maps.
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