How did the Egyptians get the technology to build the Pyramids?

I was watching the Discovery channel tonight and they were talking about the Egyptian pyramids along with Easter Island and a lot of other anomalies on our planet Earth. The question is how the heck did the Egyptians along with the Mayans and everyone else in a unadvanced time have the technology to build huge temples?? How did they have the technology to make the advanced drawing they did? How did they learn this? The theories are really interesting. Some say it was aliens. Actually who else could it be? We did not have the technology back then with out help. So now the question is from where, and when will they be back?