On Mars, people tend to live out of doors, in the open.
http://www.holyconservancy.org/images/MARS/ROVOPP08.png
http://www.holyconservancy.org/images/MARS/vikinglander1-2COL.jpg
http://www.holyconservancy.org/images/MARS/VikingFrostCOL.jpg
However, buildings do exist; but they [Mars people] apparently don't want them TO SHOW.
http://www.holyconservancy.org/images/MARS/H07.vic.03#011.png
http://www.holyconservancy.org/images/MARS/marshotND.png
http://www.holyconservancy.org/images/MARS/marsdome.jpg

http://www.holyconservancy.org/images/MARS/1P220239540EFF77UNP2446L5M1_L2L5L5L7L7.png
That building on the upper right is a replica of this building at East Hills, also at upper right. What they do is form a white roof that looks like a rock; and then then build a structure under it, so from the air, it's just another rock--just like the next one.
http://www.holyconservancy.org/images/MARS/H06.1098PIA3622.89.06milit.jpg
Rockfaces are apartment houses, as this one at Victoria Crater.
http://www.holyconservancy.org/images/MARS/H06.vic.03#004.jpg
This whole mountain is a military base with five entrances, at Ultreya Homeplate.
http://www.holyconservancy.org/images/MARS/H05.UltBASE5b1158.png
a segment of the whole panorama of Ultreya Plateau, where you see road-building going on.
http://www.holyconservancy.org/images/MARS/H05.UltBASE1b7800.jpg
NASA hides architecture and habitations under black paint.
http://www.holyconservancy.org/images/MARS/H05.Meri.03.001b1200.png



