Unless you've ever lived on, bought books from, or had trouble crossing one, you probably haven't given much thought to borders. But truth be told, how they're drawn and what's used to delineate them can be fascinating. For example: What do a triangular picnic table, two rivers, and a friendly volleyball game have in common? At one time or another, they've all acted as a border between two or more countries, of course!
We took to Quora to find the world's most interesting international borders; here are six you should know about.