The Great Pyramid of Giza is the largest Egyptian pyramid and the tomb of the Fourth Dynasty pharaoh Khufu . Built in the early 26th century BC over a period of about 27 years, the pyramid is the oldest of the Seven Wonders of the Ancient World, and the only one that has remained largely intact. As part of the Giza pyramid complex, it was adjacent to present-day Giza in Greater Cairo, Egypt.
Originally standing at 146.6 meters (481 ft), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. Over time, most of the sheathing of fine white limestone was removed, which lowered the pyramid's height to its present day 138.5 meters (454.4 ft). What is visible today is the underlying core structure. The base is measured to be approximately 230.3 meters (755.6 ft) square, giving a volume of approximately 2.6 million cubic meters (92 million cubic feet), which includes an internal small hill.