[mutley]

Sundaland may have been Atlantis.

It would certainly make sense out of the historical record. And the immediate production of language, writing and engineering. I have a hard time seeing the Giza pyramids as the result of attempts at construction.

[muawiyah]

There are earlier serious stone works in Upper Egypt that date from the time when the Sahara was just finished with its conversion from grasslands to desert.

Giza didn't happen first ~ it happened "later" after a period of development. And yes, there is a "test pyramid" ~ check out "The Step Pyramid of Saqqara built for King Zoser". I believe a later, larger pyramid, was initially built at too steep an angle and started to collapse. They changed the angle on the upper portion.