Radio 4 in Four - What鈥檚 the most expensive object ever built? - 蜜芽传媒 Sounds
Radio 4 in Four - What鈥檚 the most expensive object ever built? - 蜜芽传媒 Sounds
What鈥檚 the most expensive object ever built?
Tim Harford takes a look at some of the most costly building projects on the planet.
