On the twentieth, Neil Armstrong and Edwin Aldrin entered the Lunar module, called the Eagle. Michael Collins remained in the command module, the Columbia.
The lunar module, of course, was the part of the spaceship that would actually land on the moon – that is, would actually go to the surface of the moon.
Crowley built the lunar module and space capsule to scale, meanwhile the Saturn 5 model is only 14 feet tall about 125th the size of the actual rocket - yet it looks exactly like it.