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From the Great Wall to the US interstate system: The most expensive megaprojects ever

Lovemoney Logo By Daniel Coughlin of Lovemoney | Slide 2 of 31: Phase one of the world's largest ongoing metro megaproject, Doha's rapid transit system, is 90% complete, and undergoing testing before the opening date is finalized. The metro system will eventually have four lines served by driverless trains stretching over 186 miles, and stopping at a total of 100 ultra-modern stations.

30. Doha Metro, Qatar: $36 billion

Phase one of the world's largest ongoing metro megaproject, Doha's rapid transit system, is 90% complete, and undergoing testing before the opening date is finalized. The metro system will eventually have four lines served by driverless trains stretching over 186 miles, and stopping at a total of 100 ultra-modern stations.
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