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"Inca City" on Mars: these stunning landscapes are probably the result of natural erosion, by wind or water.
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"Inca City" on Mars: same image in negative colors. The images come from the Mariner 9 space probe.
Another type of unusual landscape: it appears that flowing waters might have carved into an ancient crater. Lots of strangle angles can be observed:
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The same picture in negative colors:
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