This huge face was photographed  in 1976 from the VIKING MARTIAN Orbiter 1.

From a Geophysics/Astrophysics point of view it is quite hard to explain how such a feature could evolve naturally. 

Even Today most of this image of the face is observable, and in my view,  cannot be explained for this region of Mars.

This feature is quite interesting and it is located in the Cydonian Region of the planet MARS.  Some people believe this structure was made by Alien Life Forms, that perhaps to this day, inhabit the surface of  Mars?