Get a 30-day free trial with Audible at http://audible.com/wonderwhy or text wonderwhy to 500 500; choose 1 audiobook and 2 Audible originals per month. I highly recommend Prisoners of Geography, great for anyone interested in geopolitics.

In this video I look at some of the world's oldest international borders. While the oldest border itself is actually fairly easy, I look at some other old borders, and consider the possibility that some border may be even older than maps themselves, forged by natures long before the modern-day countries formed.

Music by Epidemic Sound: http://epidemicsound.com/creator

Reddit post that inspired this video:   / i_tried_to_find_the_date_of_origin_for_every