....and could only go BACK in time, what era or time would you go back to? You'd be a neutral observer, basically an invisible person where you couldn't influence events and wouldn't be in danger or wouldn't suffer during your travel.
I'd go back to the early 1500's and observe the Azteca culture in Mexico and consequent Spanish conquest.
I'd go back to the early 1500's and observe the Azteca culture in Mexico and consequent Spanish conquest.