Strange circular structures found on a photo from Mars rover Curiosity at Dingo Gap
There are no circles, it is an image artifact. Here is another picture from Dingo Gap that shows nothing at the exact same position. 

Your mind is a well-trained pattern-matching machine that makes up patterns even when they are not actually there.
In other words don't jump to conclusions. You are claiming that there are actual structures, which is one step too 'far'. 

(Credit: Emily Lakdawallah blog post)