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The greatest of the pyramids is the Pyramid of Khufu in Giza, Egypt.
It is the only one of the 7 wonders of the ancient world that still exists.
It has a volume of 2.5 million cubic metres.
You could stack around 17,000 school buses inside it, except it is mostly solid!
See Also: http://en.wikipedia.org/wiki/Great_Pyramid_of_Giza
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