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find 5 interesting facts about the pyramids of giza.
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1. the pyramids of giza are the oldest and only remaining ancient world wonders. 
2. the great pyramid of giza is the largest of the three pyramids at the giza necropolis and is estimated to have taken approximately 20 years to construct.
3. the pyramids of giza are the only remaining wonder of the seven wonders of the ancient world.
4. the pyramids of giza are made of limestone and granite.
5. the pyramids of giza have been listed as a unesco world heritage site since 1979.
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