The world is a crazy place.
If you want to learn about it and understand it you have to forget about all your beliefs, past convictions, and all cultural bias and compare nothing you learn to anything else.
They're called the Nazca lines:
http://en.wikipedia.org/wiki/Nazca_Lines
It is speculated that they where used as navigational tools for alien visitors.
Don't call me crazy, I've already caught on.
It didn't seem irrelevant to me, I mean, this thread is kind of unnecessary and could have been posted in like, another thread(this or that thread, questions thread, ect.)