Price tag: $35.7bn
Date: Estimated to complete in 2020
Al Maktoum International Airport, Dubai, has an eyewatering bill attached to its phased construction – $33bn – and it is planned for completion in 2020. The airport is being built in phases and has some impressive statistics attached to its size and capability. It will be, at the end of its time as a building site, the largest airport in the world.