Casa Batllo, modernism design by Antoni Gaudi, UNESCO World Heritage Site, old town, Barcelona, Catalonia, Spain, Europe

casa batllo modernism design by antoni gaudi unesco world heritage site old town barcelona catalonia spain europe casa batlló antoni gaudí barcelona spain architecture modernist architecture building facade colorful mosaic windows balcony sunny day cityscape travel destination landmark tourist attraction exterior design art culture europe catalonia historical landmark urban city modernism whimsical intricate detailed vibrant texture sightseeing