While searching to find the largest IT projects around the world, we found that Civil Engineering projects happened to be the some of the largest "projects" around the world, such as development of Dubai's new Airport (UAE) and developing and extending Jubail's Industrial City (seems to be one of the world's most advanced and planned Industrial place on the earth).
Image source: https://www.thebalance.com
"Creating one of the world's greatest industrial city on Jubail, is not an easy task. Jubail Industrial City, which was built more than three decades ago will double its size once completed during 2016. A cost of $80 billion for infrastructure works only, Jubail II will be the largest civil engineering project of the world. Jubail Industrial II construction is a multi-billion dollar industrial city aiming to create social benefits and to strengthen petrochemical industry."