The moon landing
I was too young to remember the moon landing, so like many don’t really comprehend how historic it was. It would have been a day the entire world was watching.
In my own lifetime, I regard the bringing down of the Berlin Wall and the collapse of the Soviet Empire as the most monumental, and not sure they will be eclipsed.
Much of the commentary on the 40th anniversary has been how little has been achieved since 1969. I do hope in my lifetime we will see someone walk on Mars, and maybe even a permanent base on the moon.