Is there any prove that the building / formations on Mars are real ?
There is no evidence to suggest that the structures that have been seen on Mars belong to anything other than the nature of planet Mars itself. The reason for this is because, back when the formations were first witnessed, people immediately matched Martian formations to formations found on planet Earth. However, decades later, we see how the quality of the technology that first sent the pictures back to Earth was nowhere near as good as it is now. Hence, with the advent of 3D technology and much more advanced astronomical technology, we can safely conclude that what we see in the surface of Mars are nothing but rocks and ripples.
There is no doubt that there are some interesting-looking formations on the surface of the planet, however, everything is apparently easy to explain, according to the most recent reports. What is officially known is that Mars is indeed a "windy" planet (check the links I include for more information on that part) with a very thin atmosphere. The combination of gravity and atmosphere make the rocks to shift quickly from place to place all around the surface , perhaps even making it possible to create patterns that, to our human eye, might look like something created by an Earthling.
Yet, do not allow all these reports to be the last word. There is a lot that we still do not know about the past of planet Mars. Who knows if we will ever find out what really happened there millions of years ago. However, considering that right now Mars is a lonely planet, we can only speculate that it is nature, and nature only, is the culprit behind the interesting patterns of rock and ripples that we can witness when we see the surface of Mars.