Inca City

Inca City is the name given to an anomaly on Mars that looks like an artificial structure.

First discovered on pictures taken by the Mariner 9 probe in 1972, more pictures were taken by the Mars Global Surveyor's (MGS) onboard camera, called the Mars Orbiter Camera (MOC) in August 2002. The pictures reveal how Inca City fits into a massive complex of anomalous structures that form a perfect circle. Further intensive research identified many more anomalous artefacts in the region. Thus the pictures tend to corroborate that Inca City most likely is an arteficial structure, and hence proof of an extraterrestrial presence on Mars.

(See also Cydonia where similar proof was found).