The first moon landing. Neil Armstrong and Buzz Aldrin became the first men to walk on the moon, and Americans were riveted to their televisions to witness the moment (I wasn't. I was living in Germany with no TV, and who knows if the Germans were covering the story anyway?).
The vision everybody had at the time is that it wouldn't be long until there would be passenger flights to the moon. Well, that doesn't seem to be happening. Do you know how many other people after Armstrong and Aldrin actually have walked on the moon? Ten! None since 1972!