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Southwest Bolivia’s Salar de Uyuni is not only the world’s largest salt flat but it’s also the largest mirror on earth! If you ever wished you could stroll through the clouds, this is the place to making that wish come true. During the rainy season, a thin layer of water develops on the 4,633-square-mile flat and reflects the sky above—leaving you to enjoy your own optical-illusion-esque dreamland.