Possibly a ‘Archaeological Site’ spotted in NASA «Global Mars Surveyor Mission» photo.
Mars Global Surveyor arrived at Mars on September 11, 1997, and has contributed a multitude of findings, including signs of past, persistent water such as an ancient delta and currently active water features in the gullies of canyon walls.
After nearly a decade of discovery, MGS went silent in November, 2006.
NASA Original Image: Here
Structure looks similar to famous Mars Face:
Reference: UFO Blogger;