Where one world ends and another begins.
I had the good fortune to visit Narva/Ivangorod this past summer, and I was struck at its similarity to Buffalo/Fort Erie in terms of being an international border divided by a narrow waterway connected by a bridge. One can even walk under the bridge along a pedestrian promenade on one side (Narva and Buffalo, in these instances) but not on the other side.
From The New York Times and definitely worth a read:
While attached to Russia by ethnicity and emotion, residents of Narva, Estonia, say they would never actually want to live there.