The Wilson Center’s Digital Archive: International History Declassified contains once-secret documents from various governments and organizations around the world. These materials, now declassified, are a rich body of historical information. With 71 collections, covering topics from the 1988 Seoul Olympic Games to the Cuban Missile Crisis to “Stalin and the Cold War,” the Digital Archive supports the research aims of three Wilson Center projects: The Cold War International History Project, The North Korea International Documentation Project, and the Nuclear Proliferation International History Project. As such, most of the document collections are focused on these areas.
You can check out the collections here.