It is left to the concrete Martians
Above, I mentioned this curious and expanded form. It looks like a hollow concrete block. There seems to be something inside the block geometric rectangular. I added these concrete blocks illustration homegrown, made here on Earth ...
See the series of photos taken by the robot on the ground on Mars "Curiosity", posted on the official website here:
The photo that interests us here. The photo was taken December 24, 2012 and posted on the website December 26, 2012. Coordinates are MASTCAM RIGHT SOL 137
ANOMALY ON MARS AND BEYOND:
Please visit Christian's website for many more photos and sightings: http://ovniparanormal.over-blog.com/