Most expensive projects in the world

The world has seen many mega-projects, but not all have turned out as planned.

Let's take a look at some projects that have changed the lives of people and some that failed to get off the ground.

NOTE: Courtesy, Business Insider

...

Interstate Highway System

Country: The United States

Inflation-adjusted cost: $459 billion

Cost in 2006: $425 billion

Global rank: 1

...

International Space Station

Country: Not applicable

Cost to date: $150 billion

Global rank: 2

...

King Abdullah Economic City

Country: Saudi Arabia

Inflation-adjusted cost: $95 billion

Cost in 2005: $86 billion

Global rank: 3

...

California High-Speed Rail

Country: The United States

Estimated cost: $98.5 billion

Global rank: 4

...

Dubailand

Country: The United Arab Emirates

Inflation-adjusted cost: $76 billion

Cost in 2003: $64 billion

Global rank: 5

...

Songdo International Business District

Country: South Korea

Estimated cost: $40 billion

Global rank: 6

...

Kansai International Airport

Country: Japan

Inflation-adjusted cost: $29 billion

Cost in 1994: $20 billion

Global rank: 7

...

Hong Kong International Airport

Country: Hong Kong

Inflation-adjusted cost: $27 billion

Cost in 1998: $20 billion

Global rank: 8

...

Beijing-Shanghai High-Speed Railway

Country: China

Inflation-adjusted cost: $26.1 billion

Cost in 2008: $25.8 billion

Global rank: 9

...

Big Dig

Country: The United States

Inflation-adjusted cost: $23.1 billion

Cost in 2007: $22 billion

Global rank: 10

...

Toei Oedo line

Country: Japan

Inflation-adjusted cost: $23 billion

Cost in 2000: $18.4 billion

Global rank: 11

...

The Airbus A380

Country: France

Inflation-adjusted cost: $23 billion

Cost in 2005: $22 billion

Global rank: 12

...

Channel Tunnel

Country: The United Kingdom

Inflation-adjusted cost: $22.4 billion

Cost in 1994: $15.4 billion

Global rank: 13

...

The Second Avenue subway expansion

Country: The United States

Inflation-adjusted cost: $17.9 billion

Cost in 2007: $17 billion

Global rank: 14

...

The John F Kennedy Airport Expansion

Country: The United States

Inflation-adjusted cost: $12.7 billion

Cost in 2001: $10.3 billion

Global rank: 15