Fun facts:
1. There are more Pyramids (not the biggest pyramids but the most) in the Sudan (Nubia) than in Egypt. 223 to be exact. Nubia ruled Egypt just like the Libyans and Greeks did at one time.
The Egyptians did not get the Pyramids right the first time, example: The Bent Pyramid at the Dashur Necropolis. They started building at 54 degrees but then had to correct it to 43 degrees otherwise it would have collapsed.
Before they Started building smooth Pyramids the Egyptians built step pyramids. For example the Step Pyramid of Djoser at Saqqara