Of Aboriginal rock paintings found in caves in Kimberley, Australia. Probably there are further performed 5000 years. It would seem that the aborigines have drawn "beings" that could be described today as "aliens".
Ancient Alien Theory~ many ancient cultures believe their ancestors were visited by "star brothers" who came from the sky. This is one example of, what some believe, is a depiction of ancient advanced technology: Stele D, Mayan site of Quiriguá, Guatemala