One of the benefits of the way that we live in large societies is that we’re able to pool our resources to embark on huge megaprojects that, in theory, are intended to benefit everyone.

Whether this be for scientific pursuits, infrastructure, or providing valuable resources to where they’re needed… complicated machinery, difficult terrain, or vast and ambitious designs can soon see the costs skyrocket. It’s time to travel the world, and beyond, to see just what’s possible when there’s enough commitment to an idea, as we take a look at the 15 most expensive construction projects ever built.