The more you look at the theories surrounding the construction of Egypt's Pyramids the more you come to the logical conclusion that even if it were possible for the Egyptians to construct them there is no evidence that they had the technology to do so; No writings exist describing how and no tools have ever been found that would be capable of cutting stones with such mathematical precision and no traces of devices capable of lifting stones weighing many tons have ever been found.

Therefor there are some logical conclusions one came come to. 1. They did it with some kind of strange lost magic that did not require technology and yet no Egyptian writings describe how such magic would work. 2. There was another ancient civilization that actually built them - but no records or trace of such a civilization has ever been found. 3. A group of yet to be proven beings {The Nephilim or Anunnaki} constructed them - but neither of these groups can be proven to be more than myth or 4. An alien civilization built them for yet to be known reasons; And we can speculate that one of the reasons was for man to one day reach a level of intelligence to where he can accept the existence of these aliens and then possibly they will manifest because they will accept that man is ready for the next level of his evolution. - An advanced alien race might see early man as too undeveloped intellectually for communication - by this logic the Pyramids exist to test Man's suitablity for higher levels and communication with a more advanced Alien race.