that last image kinda looks a little ape-like ... maybe this is the "missing link" ... or the lost Planet of the Apes

I always thought the same ... that it looks artificial and the erosion is natural ... what will the Sphinx look like in 10,000 years?

One of the probes did find that water existed on Mars at one time. It's millions of years old ... it could have been very habitable at one time ... we may never know.