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.

After the success of the first manned moon landing, NASA ups the stakes by aiming for a new destination tens of millions of miles away: Mars. This is the inside story of Project Viking. Witness the overwhelming challenges engineers and scientists faced, not only to reach the Red Planet, but to land their spacecraft and deploy computer-operated experiments to answer the universal question: Is there life beyond Earth?