Inside the secret cities that were erased from public maps for decades

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: During the Cold War, the Soviet Union built a network of hidden cities to house its most sensitive nuclear and military research. These settlements were often omitted from maps, guarded by armed perimeters, and accessible only to those with high-level security clearance and special government permits.

The concept of the closed city emerged as a defining, if clandestine, feature of the Soviet system. Initially intended as a temporary measure, these sites were established in remote regions like the Urals and Siberia to protect critical infrastructure from enemy bombers. By using geographical features like rivers and lakes, the state ensured these industrial hubs had the water necessary for heavy manufacturing and nuclear technology. To maintain secrecy, these towns were often referred to by misleading names or simple post-box numbers, such as Arzamas-16 or Chelyabinsk-65, which masked their true location and purpose.

Life inside these zones was a study in contradictions. While residents faced stringent movement controls, document checks, and the constant threat of surveillance by agencies like the KGB, they were often rewarded with superior housing and better access to consumer goods than the average Soviet citizen. The existence of these cities was frequently a state secret, and inhabitants were expected to keep their place of residence hidden from outsiders. Access was physically enforced by barbed wire fences and armed guards, ensuring that even domestic citizens required explicit authorization to enter.

Following the 1991 dissolution of the Soviet Union, the status of these locations underwent significant reform. Under the 1993 Russian constitution, many were officially designated as 'closed administrative-territorial formations' (ZATO). Today, Russia maintains 44 publicly acknowledged closed cities, housing approximately 1.5 million people. While some have opened to international cooperation—such as the Nuclear Cities Initiative involving Sarov and Snezhinsk—others remain strictly restricted. Beyond these official ZATOs, the government continues to manage additional territories that require special permits for foreigners, proving that the legacy of the closed city remains a persistent, if evolving, institutional reality.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Why a city of seven chambers shed its name to escape a nuclear shadow
• The Russian industrial powerhouse that straddles two continents
• The town built by Gulag prisoners to unlock the atom
• The Soviet Union hid a massive nuclear explosion for nearly two decades after 1957.
• Sarov: The Russian holy site that became a secret city for nuclear weapons
• How a Bolivian football club rose from a modest colonial house to continental prominence
• The Clock King is a DC Comics villain with many faces and no powers.
• How a university sports branch became a dominant force in Chilean professional football
• The ancient sewer that was large enough for a hay wagon
• The football club that survived a dictatorship's attempt to erase it
• How one soldier turned a tactically indefensible outpost into a site of heroic resistance
• Why a failed game show host became one of Batman's most persistent, overlooked foes

More in Cities · More in Countries & Cities · Latest · A–Z · All topics