Of all the files available in the FBI's online database, the most-viewed is a two-paragraph note from 1950 called the Hottel memo, and some say it proves the existence of UFOs.
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FBI Vault Reveals A UFO Memo
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Key Facts In This Video
The FBI's digital reading room, where any FBI report can be viewed online, is called the Vault. 00:00
The FBI's most viewed file details the account of an Air Force officer recovering three flying saucers in New Mexico in 1950. 00:44
There are hundreds of reports in the "unexplained" section of the FBI's Vault about UFO and alien sightings that are more popular than the most famous criminal case files. 02:03