Huh... if it was just going back, and not necessarily changing anything in the timeline? "Time tourism," we'll call it?

In trying to weigh potential events, I keep coming to the conclusion that being witness to historical, anthropological, geological, etc. -type events on Earth would not be nearly valuable enough. For most events on Earth, we have, or might have, the scientific methods to deduce the truth about an event that otherwise currently remains a mystery. If we are given the ability to time travel but have to choose 1 time to travel to, I'd try to set my sights for something that is impossible for us to know. Something, perhaps, that humans as a species could not realistically witness.

I'd probably aim for something cosmological: the birth of a star, or a supernova. Maybe witnessing the creation of the Chicxulub crater (or any extinction event).

If those weren't possible... hmm. I don't know. Maybe I'd like to talk to this guy.