Second only to the Great Wall in length, a massive and heavily fortified wall stretches across the Sahara desert. This functional military wall, known by the Moroccans as "the Berm," is 16 times longer than the one that once divided Berlin.

In 1975, Morocco claimed sovereignty over the Western Sahara, but the local Sahrawi population resisted. Thus the 1678 mile-long berm was built and fortified with tanks, radar, and roughly 120,000 soldiers who patrol 24/7. There are also an estimated 7 million landmines peppering the sands of this deadly wall.

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