The Great Pyramids of Giza
The Numerous Tombs of Royalty, Nobility, Priests and So On, ESPECIALLY THOSE in ‘The Valley of The Kings’
The Extremely Accurate Star Charts Inlaid inside several of the Tombs’ & Pyramids’ Ceilings (Pearls & Other Precious Stones/Materials were used to depict Stars and Constellations)
Many other things like one of the first Irrigation Systems implemented by a Civilization, this was essential due to the Nile River running through Egypt and the Arid Desert Landscape Surrounding this MAIN River source, made LARGE Irrigation/Canal Systems essential in order to provide enough acreage of fertile grounds to harvest enough crops to provide for the Population. This was an IMPORTANT and ESSENTIAL Technological Advancement that made it Possible for a Large Growing Population to be Sustained in the harshest of environments.