The crawler under construction in 1964.

A view of Crawler 1 in 1964.

Delivering the Saturn V rocket with Apollo 10 to the launch pad in 1969.

Apollo 11, which sent the first humans to the moon in 1969, rolls out from the vehicle assembly building.

President Jimmy Carter learns about the crawler during a tour of Kennedy Space Center in 1978.

Space Shuttle Columbia makes its way toward the launch pad for NASA's first ever shuttle launch in 1980.

Space Shuttle Columbia's first launch.

Space Shuttle Discovery prepares for the second servicing mission to the Hubble Space Telescope in 1997.

Space Shuttle Endeavour gets ready for launch on STS-67, which at the time was the longest shuttle mission to date at 16 days.

Space Shuttle Atlantis before the last shuttle flight in 2011.

The upgraded Crawler 2 goes on a test drive.

The upgraded Crawler 2 leaves the vehicle assembly building.