@evan In a city like Hanoi, the surprise would be the shops and factories with American dollars behind them.
In Lagos there'd now be way, way more people and way more pollution. Same in Mexico City.
In Durban or Johannesburg you'd notice that apartheid had vanished, and that - whoa! - Blacks are in charge.
In Gaza, you'd notice the recently destroyed buildings.
In Kharkiv you'd also notice recently bombed buildings.
So, certainly, it does depend on where the time traveler would look.