I am not sure in all the thousands of mars images, I've ever seen anything more mysterious and looking so much like a possible exit and entrance for martian spacecraft!
Please check the end of the video and see how circular those to cave looking openings look. They truly seem like openings though they are severely digitally mucked ! Also the possible tracking system on the flooring of the left opening. Here is the nasa url to Mawrth Vallis - Mars. It is one of the oldest valley on mars! http://static.uahirise.org/images/wallpaper/2880/ESP_023422_2000.jpg
The analysis I use for the photos and imagery are not mean't to be exacting, only to get you closer to understanding that there is intelligent life on mars (martians). Many of the rocks you may think are rocks, are in fact highly designed sculptures, mechanical objects etc.
Nasa is trying to leak out anomalous imagery with out of course talking about it public! Though most images have been doctored, Nasa is trying to humbly and quietly nudge us along with out going too public about it vocally. Though it is work and painstaking effort to find objects in the images that have not been altered in some way!