The Great Pyramid of Khufu (Cheops in Greek)in Egypt is the only surviving wonders of the ancient times. It was built in the 26th century BC. There are actually three pyramids located in this place along with a Sphinx. The biggest of all is The Great Pyramid of Khufu. This architectural marvel is found in Giza City, a necropolis of ancient Memphis, and today part of Greater Cairo, Egypt.
This place is a haven for 3 pyramids and a sphinx. The pyramids are Great Pyramid of Khufu, Great pyramid of Khafre and
Great Pyramid of Menkaure.

King Khufu built the great pyramid sometime around 2560 BC. He was the second pharoah of the fourth dynasty of rulers in Egypt. It took about 20 years to build the pyramid of Khufu. On completion, it measured 146 m. Over the years, it lost 10 m (30 ft) off its top.It was one of the tallest structures of the world till Eiffel Tower was built in 1889. The site was first prepared, and blocks of stone were transported and placed. An outer casing (which disappeared over the years) was then used to smooth the surface. Although it is not known how the blocks were put in place, several theories have been proposed. One theory involves the construction of a straight or spiral ramp that was raised as the construction proceeded. This ramp, coated with mud and water, eased the displacement of the blocks which were pushed (or pulled) into place. A second theory suggests that the blocks were placed using long levers with a short angled foot. The apex of the pyramid is missing and looks like it was never installed. The casings of the pyramids were removed by the Arabs during 14th century. The sloping angle of the sides is 51 degrees and 51 minutes. Each side is oriented towards one of the cardinal points of the compass that is north, south, east and west. The horizontal cross section of the pyramid is square at any level, with each side measuring 229 m (751 ft) in length. The maximum error between side lengths is astonishingly less than 0.1%. All of the interior stones fit extremely well. This deserves a place among one of the seven wonders of world on account of its precision. The pyramid's entrance is in the north. The King Khufu's chamber is located at the heart of the pyramid, only accessible through the Great Gallery and an ascending corridor. The king's coffin is made out of red granite. Five boat pits surround Khufu's Pyramid on the south and the east. Two of these are believed to have been used by the Pharaoh during his life time. One boat is made into a Boat Museum. Another theory sufggests that the boat was used to carry the body of Khufu in his last journey on earth before being buried inside the pyramid. It may also serve him as a means of transportation in his afterlife journey according to the ancient Egyptian beliefs. Today, the Great Pyramid is enclosed, together with the other pyramids and the Sphinx, in the touristic region of the Giza Plateau.

The base area of Khufu's pyramid is equal in size to that of six big-city blocks. Most of the chiseled stones used to build this pyramid are as big as small pickup trucks. The beautiful and smooth limestone that was used to cover the rugged exterior Of Khufu's tomb was subsequently used up by the later rulers for their own buildings. This resulted in the lowering of the height of the pyramid. It also shortened its base width. The pyramid has three burial chambers - the upper (where he was put to rest), the middle (called "Queen's Chamber") and the lower (carved out of the solid rock below the pyramid). The "Queen's Chamber" was actually designed for the pharoah's burial use, but was eventually abandoned in favor of the bigger upper burial chamber. His queens were buried in the three small stand-alone pyramids at the base of his pyramid. Peasants were mainly engaged in the construction of the pyramaid. The peasants needed income during the annual flooding of the Nile which submerged the riverside plots of land. Their belief in the divine status of their pharoah Khufu was an added motivation. Once it was legal to climb Khufu's pyramid. Today, however the government has prohibited the tourists to climb it as a preventive measure against vandalism.