Some cities, such as Perm, were opened well before the fall of the Soviet Union; others, such as Kaliningrad and Vladivostok, remained closed until as late as 1992.
Enkelte byer, som for eksempel Perm, blev åbnet længe før Sovjetunionens fald, mens andre, som Kaliningrad og Vladivostok, forblev lukkede helt frem til 1992.