In 1976 NASA's Viking 1 spacecraft was making its way around Mars. It was tasked with taking pictures of possible landing sites for Viking 2. Scientists tend to be quick to logic but there had to be at least a couple heartbeats skipped when Viking 1 sent back the image of a human-like face.
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This rock formation is now known as the "Face on Mars" and it's an eery one. Even NASA, understanding the face was just another mesa, got a kick out of the image. They released it publicly within days with the caption including "huge rock formation ... which resembles a human head ... formed by shadows giving the illusion of eyes, nose and mouth." Since then the Face has become pop culture history and a great topic for conspiracy theorists.
In the decades since the Face was first beamed to Earth, NASA has given very clear reasoning as to why it looked the way it did. Shadows were part of it, like it's cousin, the Man on the Moon. The old technology was another factor. In the time since we were introduced, we have taken additional (better quality) images of this area and the Face is no match for high resolution.
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Read more about the face on Mars:
NASA: Unmasking the Face on Mars
Slate: Refacing the Face on Mars
Discovery News: Moses on Mars and Other Faces: Photos