Costa Rica; September 4, 1971
The legend: An official mapping aircraft of the Costa Rican government took this photograph in 1971. The aircraft was flying at an altitude of 10,000 feet over Lago de Cote. An investigation was unable to identify the object as a “known” aircraft. No “earthly” criteria have ever been given to explain the object. Debunkers took some stabs at it, but the photograph is still recognized as authentic by most investigators.
Apollo 16 / Moon; April 16-27, 1967
The legend: The UFO is pictured at just right of the top center of the photo. No explanation has been given for the object.