Closed city
A closed city or town is a settlement where travel or residency is restricted. In the Soviet Union, closed cities were quarantined for research and military purposes.
A closed city or town is a settlement where travel or residency is restricted. In the Soviet Union, closed cities were quarantined for research and military purposes.
A closed city or town is a settlement where travel or residency is restricted. In the Soviet Union, closed cities were quarantined for research and military purposes.
Source: Wikipedia "Closed city" · CC BY-SA 4.0
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