Above photo is grey scale, but only the structures remain normal color.
Date of sighting: September 2015
Location of sighting: Mars
Source photo 1: http://mars.jpl.nasa.gov/msl-raw-images/msss/01074/mcam/1074MR0047260010600092E01_DXXX.jpg
Source photo 2: http://mars.jpl.nasa.gov/msl-raw-images/msss/01074/mcam/1074MR0047260040600095E01_DXXX.jpg
This ancient city was found by Martian Archeology of Youtube. He found a pyramid, maybe even two if the one on the far left in the video is one. He also found the walls of a very large building to the right of the small pyramid. These structures are big enough for a human to live in. I can't believe it...its just a fantastic discovery by Martian Archeology.
Scott C. Waring