I'm not claiming that some of these things can't be used as landmarks. Many can be because they're easily recognizable by most humans. What I am saying is that they are not man made.
Can you prove that nature made them? You are asserting your opinion, not science, no proof either way.
Just because there is no proof at all, can you persuade anyone that you're right with your assumptions?
Possibly, because as you have said, people are often times persuadable, or as you have put it, "Gullible".
So how do you know for sure, you don't. Columbus supposedly sailed unadvisedly, when it was widely
thought the world wasn't round, but square. So where did the knowledge of the now known previous
explorers go? Time passes, & then people have no real knowledge of what had taken place in older
times, but that doesn't mean there's no signs that are left for present time observators to prove or
disprove, in theoretical speculation... And without the scientific research, that's all it is. If it were all
naturally occurring then how did it happen for so many of them to resemble human like features?
If you are right, & no man or Angel, etc. had any part in creating those images, how is it that they
appear like they do? Doesn't it seem quite a bit unexplainably coincedental? What about Petra?
There's always been naysayers that say NO, & then there's often been achievers. Though much
of the Ancient's History has either been hidden, not understood, or not passed on & forgotten,
only the unknown mysterious and unexplained signs remain to be pondered, theorized, & so
speculated on. But when feasable hard evidence is found, it seems the doubters still say "NO".