What is the most expensive object ever built?

Available for over a year

EDF have calculated the building costs of Hinkley Point, a brand new nuclear power station in the UK, will amount to £18 billion. Would that make it the most expensive 'object' ever built? Ed Davey and Tim Harford compare this with the Great Pyramid of Giza, the Oakland Bay bridge, the Grand Mosque in Mecca, the Large Hadron Collider and Hong Kong Airport. Photo: Egyptians ride their camels past the pyramid of Khafre (Chefren) in Giza. Credit: Patrick Baz/AFP/Getty Images