There Are Many Types of Pyramids

 It is believed that it took twenty years for a force of 100,000 oppressed slaves to build the pyramid and another ten years to build a stone causeway that connected it to a temple in the valley.

 There are about eighty pyramids known today from ancient Egypt.  The three largest and best preserved of these were built here at Giza at the beginning of the Old Kingdom.

                      The most well-known of these pyramids were built for the pharaoh Khufu.