The Pyramids of Giza:
    These massive, 4,000 year old structures have intrigued people for ages. Each of them were constructed by crews of  20,000 to 30,000 men and could take up to 20 years to build! Each pyramid's construction began when a pharaoh took the throne because it had to be finished by the time that he died. These three pyramids were built for the pharaohs Khufu, Khafre, and Menkuare.
 

The Earliest Pyramid:     The first pyramid constructed was built for king Snefru the first in the fourth dynasty. It was built at Dashur to be an indestructible tomb to protect Snefru all throughout the afterlife. Construction:     Pyramids were built using huge blocks of quarried limestone. The earlier pyramids had the burial chambers under the pyramid, but when these tombs were easily robbed, the chambers were moved to the heart of the pyramid.