Gaudí in one day, the way I do it with visiting friends. Sagrada Família at 9:00 (book the Nativity tower, not the other one). Walk the Eixample grid — look up, that's the whole point. Lunch at the bar inside Mercat de la Concepció. Park Güell 16:30. Casa Batlló at the sunset slot. Not on a Monday. Half of it is closed and you will be angry.
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