The Woman on Mars

NASA’s Spirit rover captured a stunning panoramic view within Gusev Crater on September 5, 2007, resulting in the spooky appearance of a female figure wearing a dress, her arm extended horizontally. Like the squirrel on Mars, however, a view in context reveals the woman to be a fortuitously positioned rock. That said, it is a pretty cool—and haunting—illusion.
A similar sighting happened in 2015, when Curiosity spotted a figure-like entity in the rocks.