On a related note . . . while crop circles have been proven by and large to be false, what do y'alls think about the Ica-Nazca lines in South America?
For those who haven't heard of them before, they are huge, kilometers-long structures in the deserts of Peru that just look like big mounds and valleys from the ground, with no real significance. Seen from the air, however, they are huge, intricate designs of spiders, birds, etc.

That one's the spider. Kinda looks more like an ant, but has eight legs.

The hummingbird.

I don't know what the crap that is.
At any rate, while archaeologists agree that these are obviously human-made, there remains much speculation as to why. Why would they create huge structures that they would never be able to see? For the gods?
Or for the aliens?