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- closed city
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- Closed cities
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Encyclopedic overview
Closed cities — Cities and Towns (mostly in the former Soviet Union and/or present day Russian Federation) with travel and/or residency restrictions, and preauthorization requirements to enter and/or remain.
Some "closed administrative-territorial formations" house 'top secret' science + technology research installations, and/or sensitive military facilities.
Excerpted from Wikipedia’s “Category:Closed cities” article, available under the CC BY-SA 4.0 licence.