Space station ranks as an engineering marvel

All the great space endeavors in history mark as the world's greatest Engineering marvels.

But many think the $100 billion space station —a project involving 100,000 people in 15 nations on three continents — deserves consideration, too.
After all, the construction site is 220 miles high and requires a rocket-powered commute that's significantly more dangerous than traveling in airplanes, trains, ships or automobiles.
Construction workers labor in a vacuum environment, where one small rip in protective spacesuits could cause instant blood-boiling death.
And the difficulty of the job, some say, far exceeds anything previously attempted by human beings.
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