Be sure to watch around the 11 minutes mark.

+1

Anwar, there is a lot of more evidence of ancient aircrafts that were extraordinarly not possible to build by the ancient people.It is also described in many religious books, the most common being the "Vimanas" that Ravana roamed around in, the same type of craft is also described in some Chinese scripture as a "fire breathing dragon" and in Egyptian culture as a "flying boat" I have been doing research and studying these findings for some time now, and it clearly throws light that the ancient world was shared by otherworldly beings.
Secondly, if you try getting deeper in this, it is also mentioned in some books that the "flying things" were mere Mechanical with intake and exhaust ducts, and not magical that some people claimed them to be.
Sumerian scholars and historians also claim that ancient Sumeria was a very underdeveloped tribe of people living like nomads, but started building temples and structures overnight of such intricate architecture that was not possible in those times. Some archielogical findings in the early 1930's or something on these sites found cave carvings of "super humans" or astronauts in helmets and crafts which were similar to today's rockets. They concluded that unlike earth, which was then a young planet in the solar system was shared by beings from other galaxies for our Minerals deposits.
Well, there is much more..

Another angle which i keep wondering ..  we all know that space and time travel will be a reality in future, perhaps in another 500yrs at least. It could be that humans from future would have travelled back in time to teach ancient civilizations certain ways of life !!!!!