How were the Pyramids of Egypt really built?

If limestone blocks were dragged up a mud brick ramp to be placed at the top of the Great Pyramid, where is the evidence of this huge ramp? How could materials such as wooden rollers and mud bricks take the strain put on them by tons of stone? Thousands of men are supposed to have dragged the building blocks across the desert in the searing heat - how did the ancient project managers keep morale up amongst the dusty and tired workforce?

In this video we will investigate how the Pyramids were really built. Enjoy!