If you ever needed more proof of the amazing feats engineers are capable of, take a look at these 19 projects that boggle the mind with their scale and ambition.
Ranging from London's Crossrail project – the largest construction project ever undertaken in Europe – to China's Jiaozhou Bay Bridge, the world's longest cross-sea bridge, the man-power, materials and money invested in these projects is breathtaking.
See the full list of projects compiled by Business Insider
here.
Image: China's Jiaozhou Bay Bridge