Okay, kicking off the Lego sets with one of my oldest big ones, the Beta I Command Base from 1980. This is pretty representative of the early Classic Space aesthetic, which just has NASA style retro-future all over it. The boxy base, tiny rover, booster rockets - all classic designs that seem inspired by NASA equipment and concept art. And of course the Classic Space logo is somewhat reminiscent of NASA’s as well.
The builds from this era tend to be a bit more clunky and simple than modern stuff (most ships are based heavily on flat wing plates, lots of right angles, etc), but you can’t beat the attention to detail in this set. The guys chilling in the base have their own coffee mug, posts to hang their unused oxygen tanks, a unique big monitor screen, equipment racks, seats, and beds. The simple straight monorail track leading to the launchpad is pretty cool for a set this size. And the base windows even tilt open, which seems like a questionable choice on the moon, but hey.