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Freddy Mamani has changed El Alto, a city in the Bolivian Andes. He's an architect, possibly the most famous in the country. His extraordinarily bold, brightly coloured buildings in geometric designs dominate the city. Some people say they look like flamboyant spaceships. But they're more than simply striking constructions. They're about his roots, and his desire to revitalise indigenous culture. (Photo: Freddy Mamani. Credit: Aizar Raldes / AFP / Getty Images)