During the
Mariner 9 mission in 1972, when first closely mapping features on Mars, members of the imaging team noticed a very strange feature at 82° S latitude and 66° W longitude. A straight grid of straight walls and square depressions, typically 3 km on a side. It was a natural formation, but the origin was difficult to determine. Mariner 9 teammates informally referred to this formation as Inca City, just as Viking teammates later quirkyly affectionately dubbed it
Face on Mars. It vaguely resembles the ruins of an ancient abandoned city with walls and squares. If you wanted to pretend there were alien artifacts on a distant world, Inca City might have been a better candidate than Face on Mars.
Book: A traveler's guide to mars
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