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.
Yes,but the border between South and North Korea is unlike any other border you'll find today.It's at least somewhat like the East Germany/West Germany border...which I visited in the 80's.Happily for us the US/Canadian border is nothing like that,although it might not be a bad thing for the US/Mexico border to be of a similar nature.