Top 10 Most Expensive Construction Projects Ever in the World

10. The Channel Tunnel – $22.4 Billion

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9. The Big Dig – $23.1 Billion

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8. Kansai International Airport – $29 Billions

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7. California High Speed Rail – $33 Billion

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6. Songdo International Business District – $40 Billions

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5. Dubailand – $76 Billions

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4. King Abdullah Economic City – $86 Billions

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3. Kashagan Fields – $116 Billions

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2. The International Space Station – $150 Billions

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1. The US Interstate Highway System – $459 Billion

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