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The rooftop of La Pedrera. Barcelona, Catalonia, Spain.

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Inner column of Gaudi's La Pedrera, looking up to the roof. Barcelona, Catalonia, Spain.

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Visitors enjoy the architecture of the roof of La Pedrera, Barcelona, Catalonia, Spain.

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Casa Mila ("La Pedrera"), a corner appartment block designed by Antoni Gaudi. Barcelona, Catalonia, Spain.

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One of the inner courtyards of Casa Mila / La Pedrera. Barcelona, Catalonia, Spain.

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Close-up of the sentinels on the roof of La Pedrera. Barcelona, Catalonia, Spain.

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"Sentinels" on the roof of La Pedrera, Barcelona, Catalonia, Spain.

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Stone mosaic detail of stairway entrance on roof of La Pedrera, Barcelona, Catalonia, Spain.

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Sagrada Familia, the cathedral designed by Gaudi, through a corner arch of La Pedrera. Barcelona, Catalonia, Spain.

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Gaudi sculpture on the roof of La Pedrera, Barcelona, Catalonia, Spain.

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View through Gaudi's sculpture to the "sentinels" on the roof of La Pedrera. Barcelona, Catalonia, Spain.

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Gaudi sculpture on the roof of La Pedrera, Barcelona, Catalonia, Spain.

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Stairwell entrance on the roof of La Pedrera, Barcelona, Catalonia, Spain.

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"Sentinels" guard the skies on the roof of Gaudi's La Pedrera, Barcelona, Catalonia, Spain.

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Close-up of a "sentinel" on the roof of Gaudi's "La Pedrera", Barcelona, Catalonia, Spain.

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The roof of Gaudi's La Pedrera, reflected in a wide-angle mirror.

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Rear of Gaudi's La Pedrera, Barcelona, Catalonia, Spain.

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Rear of Gaudi's La Pedrera, showing the intricate wrought iron balconies. Barecelona, Catalonia, Spain.

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Brick archways inside the loft space of La Pedrera, Barcelona, Catalonia, Italy.