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4. Sagrada Família
One cannot mention Barcelona without highlighting the Sagrada Família, the monumental unfinished Roman Catholic church. Construction commenced in 1882, with Antoni Gaudí taking over as chief architect shortly after. The blend of Gothic and Art Nouveau styles makes it a breathtaking spectacle. Though it's not yet complete—set to finish by 2026—it remains a UNESCO World Heritage Site and is a must-visit. To avoid waiting in long lines, it is advisable to book tickets online.