The ancient Egyptians built pyramids as tombs for the pharaohs and their queens. The pharaohs were buried in pyramids of many different shapes and sizes from before the beginning of the Old Kingdom to the end of the Middle Kingdom.
There are about eighty pyramids known today from ancient Egypt. The three largest and best-preserved of these were built at Giza at the beginning of the Old Kingdom. The most well-known of these pyramids was built for the pharaoh Khufu. It is known as the 'Great Pyramid'.
参考资料：http://chat.pep.com.cn/lb5000/topic.cgi?forum=10&topic=6137