Giza is a city in Egypt on the bank of river Nile. After Cairo and Alexandria, it is the third largest city in Egypt. The Great Pyramid was the tallest building in the world until the 19th century. The length of the side of the pyramid has reduced from 754 feet (230.33 meters) to 745 feet (227 meters). The Pyramids of Ancient Egypt were built as tombs for Kings (and Queens). Amongst 93 Pyramids in Egypt, the most famous ones are those at Giza. All work was done without machinery.were needed 40.000 people. We have to note that the Egyptians did not know then wheel and all work is done without any machinery. It was constructed using around 2,300,000 limestone block. Each block weighed on average, 2.5 tons. Building this in 20 years required installing approximately 800 tonnes of stone every day. It is made of 2.3 million blocks which means more than 12 of the blocks must have been moved into place each hour, day and night. It took the lives of millions of poor people as they were treated savagely by the Pharaohs.