5. Skylab

From satellites to the moon, NASA has conducted dozens of successful missions to space. These are some of the most famous. We'll start with a look at NASA's first space station.

4. Spacewalking

The Gemini 4 mission saw the first spacewalk of the American space program.

3. Reaching Orbit

John Glenn becomes the first American to orbit the Earth.

2. Freedom 7

Alan Shepard becomes the first American in space.

1. Winning the Space Race

NASA achieved the impossible with the success of the Apollo 11 mission.