There are more than 100 pyramids in Egypt, with the largest and most famous being the complex of pyramids in Giza Necropolis, Cairo, Egypt. This complex consists of the Great Pyramid of Giza (tomb of the Egyptian pharaoh Khufu or Cheops), the Pyramid of Khafre, the Pyramid of Menkaure, the Great Sphinx statue, as well as several other smaller satellite pyramids.
Let’s take, for instance, the Great Pyramid of Giza, the only surviving member of the Seven Wonders of the Ancient World. When it was completed in 2560 BC, the pyramid was 481 feet (147 m) tall with each base side being 758 feet (231 m) wide. The blocks weigh about 1.5 tons each, with the internal granite blocks used as the roof of the burial chamber being about 80 tons each. The ancient Egyptians knew what they were doing: the base sides have a mean margin of error of only 2 1/3 inch (58 mm)! Needless to say, it is an amazing work of engineering.
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