The Great Pyramid of Giza, also known as the Pyramid of Khufu or the Pyramid of Cheops, is located in Greater Cairo, Egypt, and is the oldest and largest of the pyramids in the Giza pyramid complex surrounding present-day Giza. It is also the oldest of the Seven Wonders of the Ancient World, and it is the only wonder that has survived to the present day without being destroyed to a large extent, and is the least affected by time and environmental conditions. Egyptologists have concluded that the pyramid was built in the 26th century BC as a tomb for Khufu, the fourth Dynasty Egyptian pharaoh, and they estimate it was completed in about 27 years. In the construction of this mysterious pyramid, 2.3 million large blocks with an estimated total weight of 6 million tons were used. Although many scientific and alternative hypotheses try to explain how the giant blocks of the Pyramid of Giza were quarried under the conditions of that period. How the blocks extracted from there were transported to Giza from miles away, how this building with a magnificent architecture was built and how this whole process actually happened are still a matter of curiosity.