Forget the face on Mars!  Here's a clear Virgin Mary and baby Jesus carved no doubt as a Martian Christmas Card to us!

http://hirise.lpl.arizona.edu/anaglyph/singula.php?ID=PSP_001978_2180

If you have not done so, get your blue/red 3d glasses and explore the hirise  pictures.  If you are like me, it takes a while for your eyes to adjust. But when they do "get the message"  you will have mountains and craters zooming a foot out the front and back of your screen! Really! Makes our grand canyon look just a little like pee wee canyon.