Updated, on July 28, 2015: Added new photos and there is also a massive transport ship in it!
Date of discovery: July 14, 2015
Location of discovery: Mars
Source photo: http://viewer.mars.asu.edu/planetview/inst/hirise/PSP_009760_2650_RED#P=PSP_009760_2650_RED&T=2
Look at this amazing discovery of a massive structure on Mars. This object looks like a wall, but understand that it is hundreds of meters thick, and that would make it a building. It also look like the building is the side of the entrance to an underground base. Did you notice the rectangle dark shadow to its right...thats the entrance. SCW
Do you notice the ship in the screenshot above? Its very cool looking and a white in color. I've seen other white ones on the moon.