Barcelona, Spain. Bizarre and otherworldly, these are chimney stacks on the roof of Casa Mila, the last building that Gaudi designed before putting all the rest of his life's effort into La Sacrada Familia.

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Casa Mila is an apartment building like no other. Nicknamed La Pedrera (the quarry) by the people of Barcelona, it's a building in which Dr. Seuss would be at home. There doesn't appear to be a straight line in the place, it's all undulating curves. And the rooftop? That's where Gaudi's imagination really takes off.