Were there reasons to build massive walls on Mars? Did they want to keep something out - or someting inside these well-squared walls?
A huge rectangular feature resembling raised walls appears in the Arabia Terra region of Mars. In the upper left corner of the walled area, there is a huge face image staring up at us, complete with a teardrop on the cheek (similar to the Cydonia face and the Victoria Crater Mount Rushmore face). The rectangular feature has been widely popularized by Paul Anderson, however, I do not know the original discoverer of it.
Rectangular depressions are important in discovering sites of ancient ruins. See, for example, these articles: http://www.astrosurf.com/lunascan/arkhipov2.htm and http://www.astrosurf.com/lunascan/arkhipov3.htm
This video demonstrates for the first time, as far as I know, that a face like image appears in one corner of the rectangle and a circular depression (contour reversal may give it the illusion of a dome shape) appears near the middle of the rectangle.
This is the link to the original photo:
Image credit: NASA\JPL\MSSS
Raw Images Courtesy of NASA and ESA. Special thanks to EVERYONE who has contributed in the search for Mars anomalies. Also thanks to Google, Picasa, ImageShack, and Photobucket.