The Egyptian Pyramid (compared to the Mayans')

This is the Egyptian Pyramid.

This is the wonder of the world, one of the unsolved mysteries.

How could the the Egyptians build such an enormous building? This huge building needs advanced technology to complete, but during the Iron Age, people didn't have such technology. So, how did Egyptians build the pyramids? Although many scienctis had inferred how the pyramids were built, not everyone has agreed.

Among the inferences, two are acceptable:
1) The aid of aliens;
2) The physical method--the Egyptian may have such knowledge...
and mine--time-travel again.

The aliens maybe suitable, but this is barely a match with the existence of aliens. We don't know much about the existence of them, maybe there are aliens, or maybe not. So, this inference has 50:50 chance to be right.

The knowledge of the Egyptians were limited, so the second theory may be wrong; but the third one may be acceptable...I had explained the method to travel trough time...so, what do you think?

Do the Egyptians and the Mayans share the same origin? But their gods are not the same, with the exception of Ra being the same as the sun god of the Mayan, and if these two civilisations shared the snake god, why can't they be from the same origin?