How were the Pyramids built? – Ancient engineering explained!

The Pyramid of Khufu, mostly known as the Great Pyramid of Giza is the largest and oldest of the three pyramids located in the Giza Necropolis in Egypt. Thus, this pyramid is the oldest of the Seven Wonders of the Ancient World and one of the few that remains intact. How the pyramids were built is still a mystery, even though there have been many hypothesis. In the video below, Mark Lehner, an Egyptologist, tells us his own hypothesis on the construction of the pyramids.