Top 10 Most Costly Construction Projects Ever

2. The International Space Station

Where: Earth's Orbit All in all: almost $150 billion Year Completed: 2009 Nations from all around the world united in 1998 to complete one of the largest and most challenging projects in space architecture, even though the "Space Race" had long since ended. It took over thirty missions and more than $150 billion to finish the initial building of this structure, which measured more than three hundred feet in length and weighed more than nine hundred thousand pounds. It is four times bigger than the Russian space station Mir and five times larger than the United States' Skylab.

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The International Space Station ©Shutterstock/Andrey Armyagov A combined Russian and American crew became the first to live on the International Space Station (ISS) on November 2, 2000, and they stayed there for several months. Over the course of more than two decades, 242 people from 19 different countries have resided continuously aboard the International Space Station. The International Space Station (ISS) orbits the planet at a speed of 4.76 miles per second, completing 15.54 daily orbits of the planet. The International Space Station's funding only extends until 2025, and it may be de-orbited in 2030, therefore it will be interesting to see if it stays in orbit for the ensuing ten years.