Must go countries for vacation?

my aunt, mom aunts friend, and i were planning on going to australia and new zealand for next summer but now my aunt isnt too sure because its going to be their winter when we go. so now we are trying to see where we really want to go .. we were thinking paris to see the Eiffel tower but we dont really know yet about that either so whats an amazing country in your opinion ( my aunt has been almost all over the world.. she has been to africa hawaii and certain parts of europe i think it was mainly the religious areas like italy and whatnot.. i have been to china with my aunt and loved it but she doesn't want to go to any asian countries..) so what are some countries that are amazing to go on vacation to