Some people believe that at one ancient time, there were huge trees here on earth, which were somehow cut down, because the rock formations look like enormous tree stumps. Other rock formations look like animals , or even human figures, and it is amazing how realistic some of these look. Here is a rock formation from Iceland that totally looks like an elephant.
The "Old Man of the Mountain" in the White Mountains of New Hampshire. Unfortunately, it crashed down several years ago and I didn't get to see anything but a small reproduction of it.