What are those really big designs on the ground that you can see from miles above in South America?

From what I remember, these are prehistoric and somewhere on some mountain range or on some flatlands in South America where if you were looking from ground level, it would look like an unremarkable mound. But when viewed from ten miles above ground, the line on the ground forms the rudimentary shape of a man or a spider or a hummingbird. They are also found in some parts of Europe as well.

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