flying saucersaka Tman/Flickr

Nearly 40 years ago, the CIA declassified a mountain of documents related to UFO sightings.

Now that "The X-Files" has been revived as a miniseries, the CIA decided to resurface those files. Many of them trace back to the early 1950s, at a time when political tensions were still frozen over and flying objects were seen as national security threats.

Here are some of the most interesting.

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