What would an ancient alien base look like on Mars? Well this photo from the NASA website clears up that question. I found an alien base at the bottom of the photo. The thing that really stands out is the square structure with a tunnel connecting a pyramid area. What this tells me is that the aliens that created it did not just roam around the planet freely but instead used the tunnels to stay safe.
The structure doesn't look white because I had to add shadow to get it to become visible, otherwise it would just be a white shiny area. In the above close up you can see a towering structure, similar in shape to the Space Needle in Seattle Washington, yet its the moon.