Coolest thing about the moon for me is that during a seismic test, crashing an object into the moon caused it to ring for hours.
Can you think of anything else as cool?
The Apollo 11 and 12 missions (and actually, all of them, I believe, incluidng 17) recorded the third stage impacts seismologically from Apollo 13 on. As the program continued, the Saturn V’s spec improved and the mass budget went up. /pedanticrantoff
https://www.space.com/31503-apollo-16-moon-rocket-crash-site-photo.html