10. Øresund Bridge

This bridge designed by Georg Rotne connects Sweden and Denmark. It is the longest road and rail bridge in Europe. The Øresund Bridge also connects the cities of Copenhagen and Malmö as well as connecting the roads of Scandinavia with those of Central and Western Europe. The bridge cost $6 billion in total.

Premiums were paid for the complexity of digging a tunnel part of the way to avoid interference with Copenhagen International Airport flight paths, and also to provide a clear channel for ships, and to prevent ice floes from blocking the strait.

9. New Bay Bridge

Scheduled to open in 2012, this $6.3 billion megaproject comprises 200 million pounds of structural steel, 5,000 miles of half-inch steel strands in the tension cables, and 450,000 cubic yards of concrete. The heaviest Skyway section weighs in at 780 tons with the largest lift in Caltrans history, a 1,700-ton steel girder that connects the Skyway to the Self-Anchored Suspension (SAS) spans on the new East Span. The height of the tower on the new SAS span is 525 ft.

With an expected lifespan of 150 years, this bridge replaces the old San Francisco-Oakland Bay Bridge, a comparative bargain $77 million in 1936 (including the Transbay Transit Terminal).

8. ITER - International Thermonuclear Experimental Reactor

The Geneva Superpower Summit in November 1985 proposed an international project aimed at developing fusion energy for peaceful purposes. Thus the ITER project was born.  Russia, the USA, the European Union and Japan were joined by China and the Republic of Korea in 2003, and India in 2005. Together, these nations represent over half of the world's population.

This experimental reactor is one of the largest and most ambitious international science projects ever conducted. ITER, which means "the way" in Latin, is being built at Cadarache, near Aix-en-Provence in Southern France at a cost $6.5 billion. Construction is expected to finish in 2016.

7. Olkiluoto Nuclear Power Plant

An investment of $7.8 billion, this power plant is being built on Olkiluoto Island, Finland.  Construction reached a milestone on June 22, 2010 after installing the reactor pressure vessel. This marked the beginning of the installation of nuclear components and start-up testing of electro-mechanical systems. The project has been delayed by three years and is now expected to be operational at the end of 2012 when it is expected to generate 14,268 kilowatt hours per year.

6. Alaska Pipeline

At a cost of $8 billion, the 800-mile-long Trans Alaska Pipeline System (TAPS) is one of the world's largest pipeline runs. From Prudhoe Bay on Alaska's North Slope to Valdez, the northernmost ice-free port in North America, Alyeska Pipeline Service Company has transported more than 16 billion barrels of oil since pipeline startup in 1977.

5. Large Hadron Collider

Built by the European Organization for Nuclear Research (CERN), the world's largest and highest-energy particle accelerator lies 300 feet below the French-Swiss border outside Geneva.  It took 16 years and $10 billion before the collider finally began its work of smashing subatomic particles on March 30, 2010, recreating conditions that occurred when the universe was less than a trillionth of a second old.

4. CVN-78 Gerald R. Ford Class Aircraft Carrier

The US Navy's program CVN 21 for the future generation aircraft carrier was previously known as the CVN(X) program. In January 2007, The US Navy announced that the new class would be called the Gerald R. Ford Class. The first two ships, Gerald R. Ford (CVN 78) and CVN 79, will be commissioned in 2015 and 2019. Northrop Grumman is developing the advanced nuclear propulsion system and a zonal electrical power distribution system. Later ships of this class will enter service at intervals of five years. A total of ten Ford class carriers are planned with construction continuing through 2058.

CVN 78 will replace USS Enterprise (CVN 65) which entered service in 1961 and will near the end of operational life by 2015. The total acquisition cost of the Gerald R Ford (CVN 78) is expected to be $11.7 billion.

3. Itaipu Dam, Brazil

Itaipu Hydroelectric Dam is the highest operational hydroelectric energy producer in the world, with an installed generation capacity of 14GW. The plant is operated by Itaipu Binacional and located on the border between Brazil and Paraguay.

The dam and plant are on the Paraná River. Construction began in February 1971 and cost $19.6 billion over 18 years of construction involving 30,000 workers. The first unit began generating power in May 1984. The second generating unit started operating the same year. Currently Itaipu has 20 generating units, each with a capacity of 700MW.

Itaipu generated 94.68 billion kWh of energy in 2008, sufficient to meet worldwide power consumption for two days. It is equal to the energy consumed by Paraguay for 11 years and by Argentina for one year. The energy generated in 2008 supplied 87% of the electricity consumed in Paraguay and 19% demanded by Brazil's interconnected system.

1.International Space Station

It has no foundations but still costs over $150 billion to build one of these. Work is ongoing and will take years to complete. The International Space Station marked its 10th anniversary of continuous human occupation on Nov. 2, 2010. Since Expedition 1, which launched Oct. 31, 2000, and docked Nov. 2, the space station has been visited by 196 individuals from eight different countries.  Since the first module, Zarya, launched at 1:40 a.m. EST on November 20, 1998, it has made a total of 68,519 orbits of our home planet, or about 1.7 billion miles on its odometer.

The space station, including its large solar arrays, spans the area of a U.S. football field, including the end zones, and weighs 827,794 pounds. The complex now has more livable room than a conventional five-bedroom house, and has two bathrooms and a gymnasium.