This video shows many Mayan artifacts that, to me, prove they were contacted by aliens or some other advanced race that had space travel capabilities:
http://www.youtube.com/watch?v=Uv86jNuJWXA
There are quite a few artifacts that depict beings with large oval eyes, like the aliens seen today.

   Here is a short video of an interview with a Mayan elder:
http://www.youtube.com/watch?v=SGpNZmniJ_Q&feature=related
He mentions the return of the ancestors and the men of wisdom. This could mean the return of the feathered serpent Kukulcan (Mayan) / Quetzalcoatl (Aztec).

   I haven't had any physical contact with aliens yet, but I sure would like to. I have had many dreams though that I met alien beings in. None of those dreams were negative or scary, but rather exciting with much detail.