I'm not sure that's true.There's a town in Northern Vermont that I pass through fairly regularly (Derby Line) that has an interesting history.It's right on the border.I've stepped right up to the little concrete "monument" indicating the border.No sign of my being in "international territory".I was standing in US territory...if I had taken one step forward I would have been in Canadian territory.
Is that the place where the border goes right through the center of the library? I’ve been there!
Interesting...
On a recent visit to South Korea, I visited the Joint Security Area in the DMZ. There, you can go inside a building that straddles the border and step into North Korea. Everyone on that tour (including me) got a picture of themselves standing next to the South Korean guard who was standing in front of the door that opens into North Korea. The border is a thin, thin line.