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Detail of chimney's and ventilation shafts on the roof of Antonio Gaudi's Casa Batllo, Barcelona, Catalunya, Spain Stock Photo - Alamy
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Casa Mila,s (Gaudi) ventilation towers on the roof of Casa Milà and the Torre Agbar (Jean Nouvel), Barcelona Stock Photo - Alamy
Detail of chimney's and ventilation shafts on the roof of Antonio Gaudi's Casa Batllo, Barcelona, Catalunya, Spain Stock Photo - Alamy
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