Walls are so effective that many countries have them on their borders. Check out this mashup video showing walls around the world.
Spain has one of the most extensive border wall systems to stop illegal immigration, located all along the perimeter of Melilla, a Spanish enclave on the North African coast.
“The first layer is a 20-foot metal fence, followed by a second fence with a flexible top that makes it harder to climb. Below the second fence is barbed wire netting strung in dense webs. Then, comes another taller fence with another flexible top section and more barbed wire. Then, you’re on the Moroccan side where you have a six-and-a-half-foot ditch and then a double fence with, you guessed it, more barbed wire.
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