The Nilosyrtis region of Mars contains numerous layers exposed along its floor. These layers formed long after an impact event and are likely deposits of dust and ice.
Besides, the region also presents dunes of dark sand that probably blew in from the surrounding terrain.
Martian Archaeoligist from YouTube looked closely at NASA’s Hirise image of the Nilosyrtis region and spotted something unnatural between the numerous layers what appears to be an ancient, long-abandoned ruin on Mars.
Again evidence that Mars was once inhabited.
Link Hirise image: