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One of the quintessential highlights of Barcelona is Sagrada Familia, an architectural marvel designed by the brilliant Antoni Gaudí. This iconic basilica, resembling an intricate piece of art, features detailed carvings and unique structures that have made it a masterpiece. Despite being under construction for over a century, its magnetism doesn't wane, drawing crowds from all corners of the globe. However, aspiring visitors should plan ahead since tickets often sell out, especially during peak seasons.