The Great Pyramid of Giza is the oldest and largest of the pyramids in the Giza pyramid complex bordering present-day Giza in Greater Cairo, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.
Egyptologists conclude that the pyramid was built as a tomb for the Fourth Dynasty Egyptian pharaoh Khufu and estimate that it was built in the 26th century BC during a period of around 27 years.
Initially standing at 146.5 metres, the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. Throughout history the majority of the smooth white limestone casing was removed, which lowered the pyramid's height to the present 138.5 metres. What is seen today is the underlying core structure. The base was measured to be about 230.3 metres square, giving a volume of roughly 2.6 million cubic metres, which includes an internal hillock.
The dimensions of the pyramid were 280 royal cubits high, a base length of 440 cubits, with a seked of 5+1/2 palms.
The Great Pyramid was built by quarrying an estimated 2.3 million large blocks weighing 6 million tonnes total.