It's July 20, 1969. Four days after Apollo 11 thundered skyward from NASA's Kennedy Space Center, astronauts Neil Armstrong and Buzz Aldrin become the first humans to set foot upon the moon, thanks to a marvel of engineering: the lunar module. It's the culmination of years of toil and millions of man-hours of engineering prowess. This is the story of the unsung heroes who built the unconventional flying machines that carried 12 Americans to the moon on six separate missions and made the dream of a generation come true.

It began as an audacious idea: to establish a permanent human presence in the most hostile environment known to man - space. It's a dream that would bring together two former Cold War enemies and lead to the most expensive structure ever built. Discover the inside story of the International Space Station. See how NASA engineers triumphed over decades of seemingly insurmountable obstacles to develop Skylab, Space Station Freedom, and finally, the International Space Station. The ISS became humanity's first permanent outpost in space and the largest space structure ever created.