This ancient structure on Mars was found by Jean Ward from Youtube this week. The structure has right angles and also has an internal baffle. The alleged building is covered in Martian sand, which makes me think they are currently unused and may have been there for thousands or millions of years.
Scott K. Waring Jean Ward (witness) states:
This photo (S1801249) was taken by NASA's Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) at 2006-05-16T14: 29: 18.02.
NASA describes this photo as "the central peak of Moresi." I first found what looked like a megalithic shape carved into the side of a mound on the surface of Mars.
It looks rectangular with parallel lines, an angle of 90 degrees, and a shadow on both sides indicates its depth.
However, after some analysis and feedback from my observer on the Dawn YouTube channel, we concluded that NASA rotated the photo 180 degrees. Also, the NASA preview image suggests that this Google Earth photo shows this megalith-like anomaly lying inside a crater, this image is correct.
Right next to the megalithic block or container / structure, there seem to be two underground entrances, i.e. a round opening and a square opening.
Some fuzzy parts of something are scattered across the two entrances. On the left is another megalithic block or container / structure with right angles and a 45-degree face.
Promotional video:
Breaking Dawn also noticed another anomaly that I forgot in my initial analysis. Further on the right, there is another anomaly that looks like an intricate doorway or entrance to an underground base or habitat, a crippled car, or a broken statue.