Photographs of the Mars surface are often intriguing, as was the case with the face. But the above is also interesting: what looks like a doorway in the Martian rocks is present on various photos from the rover, and it is discussed in this movie.
And of course there are also the conspiracy theories that claim the US already has manned bases on the Red Planet, but I guess we will have to wait to hear the truth of that until SpaceX is well into its mission of putting man on Mars for good...
