Nimrod and the Tower of Babel
All mankind was involved in building the Tower of Babel, pictured as a round tower yet all Sumer religious temples are square ziggurats. Egyptian priest Imhotep is said to have designed the square Step Pyramid. I believe Imhotep witnessed the Tower of Babel being built, and built the Sumer designed Step Pyramid when the Egyptians left Sumer; and the Egyptians built this first pyramid in Africa in Zoser's reign.
I believe Zoser was Egypt's first king. Zoser's northern border was near Gaza, matching the Canaanite border. (Genesis 10:19)Egypt worked the Sinai copper mines; copper tools were used in building the Step Pyramid.