Here it is, the Mars "Face" as it looks on the images taken in 2001 by NASA Mars Global Surveyor. It is located in the Cydonia region and maybe the most famous place on Mars.
Little technical info about the mesh and the Textures:
Terrain profile was imported from Nasa MOLA data with a resolution of 1/128 degrees per pixel. The actual area is covered by 32x32 MOLA points.
The Image is taken from NASA Mars Global Surveyor (bw) and has been colorized to match
the mars textures in orbiter. It has a resolution of about 20m per pixel (originally about 5m - i have downsampled it), enough to see that it isnt a face at all
For installation instructions please read the readme.txt included in the package.