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Antoni Gaudi's Casa Batllo, Barcelona, Catalonia, Spain.

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The Gothic arcaded gallery of the Palau de la Generalitat in Barcelona, Catalonia, Spain.

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A 'tree statue' street performer on Las Ramblas, Barcelona, Catalonia, Spain.

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Waiters at the Hotel Internacional take a quick break to people watch on the Ramblas of Barcelona, Catalonia, Spain.

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Modernist houses by Cadafalch (Casa Amatller, left) and Gaudi (Casa Batllo) on the Illa de la Discordia (avenue of discord), Barcelona, Catalonia, Spain.

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Casa Amatller, designed by Puig i Cadafalch, next to Gaudi's Casa Batllo. Barcelona, Catalonia, Spain.

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Visitors to Guadi's Casa Batllo listen to the audio guide. Barcelona, Catalonia, Spain.

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Stepped gable roof detail from Puig i Cadafalch's Casa Amatller, Barcelona, Catalonia, Spain.

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Interior of Barcelona Cathedral (La Seu), Catalonia, Spain.

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The rib-valuted ceiling of Barcelona Cathedral (La Seu), Catalonia, Spain.

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Inside the central dome of Barcelona Cathedral, Catalonia, Spain.

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Sun worshipper outside the Barri Gotic, Barcelona. Catalonia, Spain.