Belgium & Netherlands
The border just goes through houses, cafe and streets.
India & Bangladesh
Can you imagine 'A' country inside 'B' country inside 'A' country inside 'B' country, lol?
South Korea & North Korea / India & Pakistan
These are the world's high security border (just opposite to the Belgium and the Netherlands border).
I think that´s very interesting and would like to visit it
Interesting indeed, and there are many more, more or less spectacular, in the world.
Some links found on-line:
http://oddstuffmagazine.com/unusual-borders-around-the-world.html
http://www.boredpanda.com/international-borders/
http://listverse.com/2011/01/24/top-10-unusual-borders/