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research three fun facts about the pyramids of giza.
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1. the great pyramid of giza is one of the oldest surviving structures in the world and is estimated to have been built around 2550 bc.
2. the great pyramid is a tomb of the pharaoh khufu and was originally 146 meters (480 feet) tall, making it the tallest man-made structure in the world for almost 4,000 years.
3. the sides of the great pyramid of giza were perfectly aligned to the four cardinal directions, differing by less than 1/15th of a degree.
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