India is home to the longest still-standing stone wall in the world, after the Great Wall of China. What's it called?

Although, at 13,171 miles, the Great Wall of China puts the rest of the world's walls to shame, India's Kumbhalgarh Fort takes home the silver. Spanning 22 miles, the fort was built during the 15th century and served its purpose, standing up against attacking armies. The only army to capture the fort did so by poisoning its water supply.

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