If the Plains of Cydonia on Mars are an alien temple complex, who built it and why?

Sure, aliens could rule us all from the shadows. Question is, why would they bother?

If they're not going to exterminate us, aliens might find themselves in charge of saving our species.

Despite what the movie told you, we wouldn't be all that defenseless from an alien invasion.

Could we have already been contacted by aliens and just don't know it yet?

The idea that Roswell was an alien crash landing site raises more questions than provides answers.

A popular idea states that humans didn't evolve, but were created in a lab by the creatures who secretly rule over all of us.

Alien-human hybrids have become a staple of abduction tales. But are they even remotely plausible?