Projects of immense scale are never easy to execute, so it's no surprise that many are delivered late and massively over budget. With runaway inflation, even the slightest delay can add on serious costs, as seen with many flagship megaprojects worldwide. Mismanagement, political disputes, and overly ambitious engineering plans also play their part.

From power plants to high-speed rail networks, read on to discover the staggering costs of some notoriously problematic projects and find out why they're running so far behind schedule. 

All dollar amounts in US dollars unless otherwise stated.