That is a hard.
If it was something I could view just like a regular person who was a spectator it would be the same.
The resurrection.
If it was to be able to view something omnipotent like a GOD, it would be the comet impact that started the Younger Dryas period.
I would like to see how far man got this time and how many civilizations there were that traded and communicated to each other before we got scattered again by another extinction level event.