First place I'd like to have the time to go (work's been eating me up these days):
Outside the front door!
Second place:
Berlin. Still the ever-changing city it has been for decades. One must have an eye for the special mediocrity and the rare maxima and minima about it, though.
Third place:
Well, just anywhere else.
A "simple" way of accomplishing this is belonging to a minority that is being threatened or expelled, like Helmut Newton, Robert Capa, Alfred Eisenstaedt... you name them.
Or think of the humble hero of the great Brazilian movie "City of God", who, as a teenager living in the favela, keeps dreaming about a camera and a career as a photographer. When he manages the former, he finds his motifs outside his front door, again...
Let's go outdoors, career may follow!
Jesko