The great pyramid of Giza is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza, Egypt. Tt is the oldest of the seven wonders of the Ancient world, and the only one to remain largely intact. Eqyptologists believe that the pyramid was built as a tomb for the fournd 2560 B.C.E. Initially at 146.5 meters ( 481 feet), the great pyramid was the tallest man-made structure in thewarld for over 3,800 years. The great pyramid was covered by casing stones that formed a smooth outer surface, what is seen today is the unlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theorirs about the great pyramid construction techniques.