Linked from
The 20 pages that link to Nuclear weapons testing, each with the reason it gives.
Johnston AtollNarrower topic: Johnston Atoll supported atmospheric and high-altitude U.S. tests.
Tsar BombaNarrower topic: Tsar Bomba was a test explosion rather than a weapon used in war.
Severny IslandNarrower topic: Novaya Zemlya became one of the Soviet Union’s principal test grounds.
Malden IslandNarrower topic: Britain used Malden as a remote location for atmospheric nuclear tests.