Explore the World's Most Expensive Construction Marvels

9. The Crossrail Project in London

Location: London, England, United Kingdom Total Cost: $20 Billion* Year Finished: Mid-2022 Unquestionably the greatest construction project in Europe, the London Crossrail Project will connect the city beneath central London with 26 miles of new tunnels and a more than 60-mile rail route that passes through 40 stops. On May 24, 2022, the railway's major segment between Abbey Wood and Paddington opened for business.

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Dan Kitwood/Getty Images, London Crossrail Project More than 200 million passengers are expected to use this massive project annually, boosting rail capacity in central London by 10%. In addition to providing reliable and frequent train services, the London Crossrail Project has managed to inject around £42 billion into the UK economy.