From the infamous demilitarized zone separating the nations of Korea to some unusual borders along and even within the United States here’s some of the craziest human laid boundaries from around the world.

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4. San Diego - Tijuana

This amazing image shows the stark contrast between the hustle and bustle of the cramped Mexican border city of Tijuana and a sparsely populated section of the United States, specifically San Diego, California.The President of the United States recently addressed this border and the wall he wants to build on it. Donald Trump held a rally that some would term inspiring, others scary in Huntsville, Alabama on September 22. He seemed to draw from the energy of the enthusiastic crowd during his long speech and began making statements that not only made a lot of people that weren’t in attendance upset, but also uttered claims that became less and less lucid. We can’t address all of it, but we do want to talk about what he said regarding the wall that he wants to build on the U.S. Mexico border. After clarifying that a wall would in fact be built, though it was never questioned, remember it was a rally, he went on to say that the wall would have to be see through. He then shared that he thinks it would look better. Throughout this part of the speech he alternates between claiming that there’s already a wall that they will renovate and then that they will build a wall, two statements that seem to contradict each other. After going on in a somewhat incoherent fashion about people catapulting drugs over walls and explaining why he won’t build walls on rivers or mountains, he ends by saying that the renovations should be done in six or seven months and that he just wanted to let everyone know. I’m very confused while also hoping I’ll be able to make a trip up and down the border sometime soon to see what’s going on for myself.

3. The Not Too Distant Future

The Diomede (die uh meed) Islands, which are Russia’s Big Diomede and the U.S.’s little Diomede are right on the International Date Line. So, even though the island are just miles apart, they are in different time zones, meaning there’s a 21 hour difference in time between the lands. Another strange quirk in this remote part of the world is that, while Big Island remains unpopulated, Little Island is home to a small population. This hasn’t always been true, Big Island was once home to a Russian military base.

2. Wagah Border

This strip of land separating Pakistan and India is pretty normal as far as borders go, but it's the people that share the land that make it unique. Every day, two hours before sunset Pakistan Rangers on one side and Indian Border Security on the other side conduct a sort of dance that ends with a simultaneous lowering of the respective countries flags. The ceremony is very popular amongst locals and visitors alike

There’s only one more border and we won’t keep you waiting too long, but we’d like to quickly thank everyone out there for watching. Keep the comments and the interest coming and we’ll keep on churning out videos. Now to an amazing place where three nations in South America collide, here’s

1. The Triple Frontier

You won’t find a more perfect natural border than the region where Argentina, Brazil and Paraguay meet. The countries are separated by the convergence of two rivers - the Parana River and the Iguazu River. Each nation has a representative city near the conjunction. There’s a lot more to the Triple Frontier than it's convenient boundary. The largest Hydroelectric Dam in the world sits just miles away. For decades the Triple Frontier has been notorious for being host to drug and weapons smuggling. The U.S. government believed that Islamic terrorist groups such as Al Qaeda were gaining funds from these illegal, unsavory activities in the area, after “intense scrutiny” following 9/11. These accusations however have been disputed and criticized as being misguided or just plain wrong.

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