4. Mexico and the United States
Border: Fence at Naco
Area: 3,145 km* (total border length)
Est. Gross Domestic Product: $27.36 trillion (USA) / $1.811 trillion (Mexico)*
The story is turned on its head by something funny at the Naco section of the US-Mexico border, where a fence extends with the arduous duty of division: seesaws! Yes, you read correctly: vibrant seesaws stick through the fence to provide children with a pure, carefree moment of enjoyment in both nations.

Mexico and the USA ©Shutterstock/Sherry v. Smith
It seems as though these lighthearted installations are teasingly pointing out boundaries themselves, serving as a constant reminder that happiness and mirth have no bounds. This lovely twist at Naco serves as a heartfelt reminder that even in the face of the walls we put up, the little joys in life, like going on a seesaw ride, can build a bridge towards friendship and understanding.
