It is the oldest of the Seven Wonders of the Ancient World and the only one to remain largely intact. Egyptologists believe that the pyramid was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu (Cheops in Greek) over a 10 to 20-year period concluding around 2560 BCE.
Initially at 146.5 meters (481 feet), the Great Pyramid was the tallest human structure in the world for over 3,800 years. Originally, it was covered by casing stones that formed a smooth outer surface of the underlying core structure we see. Some of the casing stones that once covered the structure can still be seen around the base.
There have been varying scientific and alternative theories about the Great Pyramid's construction techniques. Most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place. These theories are based on false assumptions.
There are three known chambers inside. The lowest chamber is cut into the bedrock upon which the pyramid was built and unfinished. The so-called Queen's Chamber and King's Chamber are higher up in the structure.
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