Area 51 is probably the world’s most famous base but until now the government has denied its very existence. The CIA has finally acknowledged the not-so secret base in response to request filed under the Freedom of Information Act.
George Washington University’s National Security Archive obtained the documents detailing the history of the U-2 spy plane, which include multiple references to Area 51 that were previously redacted.
There’s no mention of aliens but conspiracy theorists will note that much of the document is still redacted.