The 3 declassified "Unknowns" from Project Blue Book: When physical trace evidence and radar data completely defied the official explanations.

From 1947 to 1969, the U.S. Air Force investigated over 12,000 UFO sightings under Project Blue Book. They successfully debunked the vast majority. But hundreds of cases remain officially classified as "Unknown" because the physical evidence simply wouldn't go away. ​Here are 3 of the most baffling historical cold cases that the military couldn't solve: ​1. The Socorro Landing Site (1964) This wasn't just a light in the sky. A police officer in New Mexico interrupted a physical landing. When...

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