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What is the most expensive 'object' ever built? There are plans in the UK to build a brand new nuclear power station called Hinckley Point. The environmental charity Greenpeace have claimed it is set to be the most expensive object on Earth. But could it really cost more to build than the Great Pyramid of Giza? We take a look at some of the most costly building projects on the planet. (Photo: Egyptians ride their camels past the pyramid of Khafre (Chefren) in Giza. Credit: Patrick Baz/AFP/Getty Images)