The "Face on Mars" was first photographed on this day in history, July 25, 1976. (NASA)

A photo from Mars taken by NASA’s Viking 1 spacecraft left
people perplexed and wondering about the possibility of
extraterrestrial life. 

Dubbed the "Face on Mars," the image appeared to show a
carving of eyes, nose and a mouth in the Martian region of
Cydonia.

NASA’s website said "the Viking 1 spacecraft (below) was
circling the planet, snapping photos of possible landing
sites for its sister ship Viking 2, when it spotted the shadowy  
likeness of a human face."