"People and Things that have changed the world or how we view it"

Alexander the Great united almost the entire known world. That's bound to be something. Hell you can even do the Persian empire the first ones to have states that could govern themselves-ish.

I say do it on the 300 spartans versus the Persian Empire.

The past shows us what to (not) do in terms of today's society. It's worth looking into.
If you want things, I suggest you do something along the revolution of paper, gunpowder, or weaponry in general.