It's probably not true, but if it were true it would sure be interesting, so it must be true. This area is also called fretted terrain because it contains many landforms that are interesting to scientists. The erosion and weathering of this terrain let scientists learn about the crust of Mars because they can study the eroded debris. Wind, frost and maybe even running water could have created these landforms. Understanding how the fretted terrain got fretted will help us understand what Mars might have been like millions of years ago.
Some people say that the face was built by some ancient civilization.
NASA says it's a natural hill. While the images of this region of Mars are spectacular, it is difficult to prove exactly how a one-mile area was formed. Since the images are not detailed enough to prove anything, you can make up your own story about how the ape-looking hill was formed. Until then, why don't you decide for yourself. Click on a picture for a way huge version.